Holiday Calendar

National Calvin Day

Next celebratedSaturday, April 10, 2027

Calvin Coolidge was born John Calvin Coolidge, and his family dropped the John. April 10 marks the name that stayed.

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Last updated September 7, 2026 · by the Holiday Calendar TeamHave an update or spot an error?
YEARLY DATEApril 10
OBSERVED INInternationally
CATEGORYNames
ORIGIN

Community Origin

FOUNDING ENTITY
Not documented
FIRST OBSERVED
Not documented
HOW THE HOLIDAY CAME TO BE

The circulation is the only record there is.

National Calvin Day circulates on holiday-listing sites and on social media, kept on April 10. No founder, sponsor or registrar has been identified, and no source names a first observance.

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INTRO

A surname meaning bald that America never put down

Calvin sounds like a name with a season. It belongs to a president, a designer and a comic-strip six-year-old, which places it somewhere in the last century and tends to leave it there. National Calvin Day sits on top of a much longer record than that.

The Social Security Administration's national files now cover 146 years, 1880 through 2025. Among boys' names in them, only 30 have ranked inside the top 250 in every single one. Calvin is one.

The rest of that list reads about as you would expect: James, John, Michael, William. The figure holds because both of the rank conventions publishers use return the same 30 names at that cutoff. Widen the cutoff to the top 1,000 and the count stops being stable.

The day sitting on top of that record is the part nobody can source.

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ORIGINS

Calvin Day history

INTRODUCTION

The name reaches English by a detour through Latin. Behind the Name derives Calvin from the French surname Cauvin, which came in turn from chauve, meaning bald. The Online Etymology Dictionary takes a different route to the same place, from the Latin cognomen Calvinus and calvus, also bald.

Both routes end at one man. Jean Cauvin was born at Noyon in Picardy on July 10, 1509. His surname was latinised as Calvinus, and English has known him as John Calvin ever since.

CHAPTER 01

The reformer who gave the name its weight

Britannica describes a city under close supervision. Geneva's consistory reached into taverns, dancing, gambling and swearing, and a significant part of the population resented it.

Michael Servetus was tried and burned in the city in 1553. Britannica says Calvin was responsible for the arrest and conviction, and adds that he had preferred a less brutal form of execution.

English-speaking families did not take up the name for a long time afterwards. Behind the Name dates its use as a given name, given in his honour, to the 19th century.

CHAPTER 02

The years the name peaked

Then the name reached the presidency. Calvin Coolidge held the office from 1923 to 1929, and he had been born John Calvin Coolidge, named for his father. The Coolidge Presidential Foundation says the family dropped the John and called him Calvin, or Cal.

The files record 1,282 boys named Calvin in 1922. Two years later the figure was 4,918, the best year the name has ever had. It fell back to 1,665 by 1929.

The surname Coolidge did something similar on a much smaller scale, first appearing in the files in 1920 and peaking at 82 boys in 1924. No source connects either curve to the presidency, so the sequence is what the record supports and all that it supports.

CHAPTER 03

A day with no author

Everything above this is documented. The day itself is not. No founder has come forward, no organisation runs it, and no source records a first observance.

The absences are at least specific ones. A full-text search of the Federal Register returns no document naming the day. On the holiday-listing sites checked, the earliest archived page giving April 10 was captured in August 2022, which dates the listing and not the day.

TIMELINE

Timeline

Jean Cauvin born in Picardy

The future reformer was born at Noyon on July 10, and his surname was later latinised as Calvinus.

Federal name records begin

The first year in the Social Security Administration's national files already lists 134 boys named Calvin.

The name's best year

The files record 4,918 boys named Calvin, the highest count and the best rank in the whole series.

Calvin Klein Inc. opens

Klein and Barry Schwartz started the company on a $10,000 loan, in offices at Manhattan's York Hotel.

Calvin and Hobbes debuts

Bill Watterson's strip first ran on November 18, with a six-year-old named for the theologian John Calvin.

Calvin's lowest rank on record

The name slipped to 231st among American boys, its weakest showing in 146 years of files.

BY THE NUMBERS

National Calvin Day by the Numbers

221,064
US boys recorded as Calvin, 1880 to 2025
43 per 10,000
Calvins per 10,000 boys listed, 1924
2,710
US boys named Calvin in 2025
132nd
Calvin's rank in SSA's 2025 file

GOOD TO KNOW

Surprising facts about National Calvin Day

Calvinism and chauvinism are etymological twins

The Online Etymology Dictionary notes that the surname Chauvin is the French form of the same Latin Calvinus, so the two words are, etymologically, twins. Chauvinism entered English in 1840, after the character Nicholas Chauvin in the Cogniards' 1831 vaudeville.

John Calvin asked for no headstone

He requested burial in an unmarked grave and is believed to lie somewhere in Geneva's Cimetière des Rois. He died there on May 27, 1564, aged 54.

A governor really did proclaim a day for a Calvin

Gretchen Whitmer proclaimed September 30, 2024 Megatron Day in Michigan for Calvin Johnson. It runs under his nickname, not his name.

The federal list hides the rarest names on purpose

The Social Security Administration publishes only names with at least five occurrences in a year, a rule its own readme gives as a privacy safeguard. Anything scarcer simply does not appear.

Calvin Klein began with a single appointment

Klein wheeled six coats and three dresses across town to an appointment at Bonwit Teller. He left with a $50,000 order.

WHY THIS DAY MATTERS

Why National Calvin Day Matters

RECORD

Download the file and you can check the name's whole run yourself.

The Social Security Administration publishes a count for every name in every year back to 1880, and anyone can download the whole set. That makes a claim about the name Calvin falsifiable in a way that a claim about April 10 is not.

LANGUAGE

A surname that survived as a first name

Calvin is a surname that turned into a given name, and the sources say plainly why: it was given in the reformer's honour. Behind the Name dates that shift to the 19th century, which makes the given name far younger than the man himself.

CALENDAR

It is not a name day in the European sense

Behind the Name's name-day index returns nothing at all for Calvin, while listing John in Austria and Sweden and Jean in France. April 10 is a national day built around a first name, which is a different thing from an entry on a name-day calendar.

GET INVOLVED

How to Observe National Calvin Day

EDITOR'S PICK

Look up a name in the federal files

The Social Security Administration publishes a count for every name and year back to 1880. Download the national data and you can plot any name's own curve in an afternoon.

READ

Read the two etymology entries side by side

Behind the Name traces Calvin to the French surname Cauvin and the word chauve, while the Online Etymology Dictionary starts from the Latin cognomen Calvinus. Comparing them shows how one name ends up with two histories.

CHECK

Check whether a name carries a name day

Behind the Name keeps an index of name days by country, and it lists them for John and for Jean. Calvin returns nothing, which is worth knowing before calling April 10 a name day.

TEST

Test a national-day claim before repeating it

The Federal Register's full-text search and the Internet Archive's capture index are both open to anyone. Running them on any national day tells you quickly whether an official record exists behind it.

Test your knowledge

How well do you know National Calvin Day?

1 / 8

What does the name Calvin originally mean?

Answer

No. No official status was found for it, a full-text search of the Federal Register returns no document naming it, and April 10 is a normal working day.

COLOPHON

Sources

How we know what’s on this page. References, not endorsements.

12sources
4primary records
6independently dated
Primary records
U.S. Social Security Administration2026-03
National data on the relative frequency of given names in US births
Annual counts for every US given name from 1880 onward, names with five or more occurrences.
View source
Calvin Coolidge Presidential Foundation
A Biographical Sketch of Calvin Coolidge
The foundation's own life of the president, including the name his family dropped.
View source
Office of Governor Gretchen Whitmer2024-09-30
Gov. Whitmer Proclaims September 30 as Megatron Day
Michigan's 2024 proclamation of Megatron Day for Calvin Johnson.
View source
Federal Register
Federal Register document search API
Full-text search across every document published in the Federal Register.
View source
Additional coverage
Behind the Name2026-05-26
Meaning, origin and history of the name Calvin
Traces Calvin to the French surname Cauvin and dates its use as a given name.
View source
Behind the Name
Name Days for the name Calvin
The site's country-by-country name-day index, queried for Calvin.
View source
Online Etymology Dictionary
Calvin
Derives the surname from the Latin cognomen Calvinus and links it to chauvinism.
View source
Encyclopaedia Britannica
John Calvin
Life of the Geneva reformer, from Noyon in 1509 to an unmarked grave in 1564.
View source
Encyclopaedia Britannica2026-08-13
Calvin and Hobbes
Account of the strip's 1985 to 1995 run and the two thinkers it was named for.
View source
NPR2025-11-18
40 years ago, Calvin and Hobbes' raucous adventures burst onto the comics page
The strip's debut date, with its editor Lee Salem on reading it for the first time.
View source
WWD
Calvin Klein History, Timeline and the Company's Reinvention
How the label began in 1968 on a $10,000 loan and a rack of coats.
View source
Nancy's Baby Names2021-04-01
How did Calvin Coolidge influence baby names in the 1920s?
A name analyst's look at Calvin and Coolidge usage across the 1920s.
View source
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