No founder, proclamation, campaign or establishment record has been documented for National Margaret Day. Its earliest traceable appearance is an Internet Archive capture from 14 August 2022 of a holiday-listing page that already carried the November 23 date.
The pearl that came from somewhere east
Both go back to a pearl. The name is first attested in English about 1300, from Old French, and behind it stand the Late Latin Margarita and the Greek margaritēs. There the trail goes cold: the Greek word's own origin is unknown.
The OED says only that it was probably adopted from some Oriental language. Beekes calls it an oriental loanword mostly assumed to be Iranian, and points at the Middle Persian marvarit, pearl.
English took the word seriously. A margarite could be a pearl, an oyster, or anything precious at all, and a corrupted conscience was a derk margarite. In the Wycliffite Bible the merchant who finds one goes and sells everything he has to buy it.


