No founder, establishing act, or registration for National Katherine Day has been identified, and no source explains the December 2 date. The day circulates through online holiday listings and event directories, which is the only documented trace of it.
Every clerk spelled it differently
The English record starts early and stays untidy. The Dictionary of Medieval Names from European Sources cites a Latin entry from 1185, spelling it Katerina. After that, clerks wrote it however it sounded to them.
A single English source from 1300 runs through Katerina, then Katharina, then Katherina. Katherine and Catherine settled as the standard pair only in the later Middle Ages. The early modern records went on regardless, carrying Katturne, Kateran and Chatery.


