If you’re starting preparations for the greenest day of the year, check your spelling before you put up your banners or take to social media. We often abbreviate St. Patrick’s Day to St. Patty’s Day, when the correct form is St. Paddy’s Day!

According to Paddynotpatty.com, Paddy is derived from the Irish, Pádraig: the source of those mysterious, emerald double-Ds. Patty is the diminutive of Patricia, or a burger, and just not something you call a fella.