No founder, establishing document or first observance is on record for National Grant Day, though the personal name it marks is documented in national name records from 1880. A US Federal Register search returns no document that names the day, and no outside holiday calendar listing it was located.
Two words, one spelling
The surname he did keep began life as a nickname. Behind the Name types Grant as a surname formed from one, taken from the Norman French grand, meaning great or large.
It looks like the ordinary English word, and its history runs somewhere else entirely. The Online Etymology Dictionary traces the verb back through Old French graanter to the Latin credentem, believing or trusting. One arrived meaning big, the other meaning take my word for it, and English gave them the same five letters.


