It’s “Paddy” because it comes from the Irish name Pádraig/Patrick , whose long‑standing nickname in Ireland is Paddy , not Patty.

Quick Scoop

1. Where “Paddy” comes from

  • In Irish, St. Patrick’s name is Pádraig (often anglicized as Padraig or Patrick).
  • The traditional Irish nickname for Pádraig/Patrick is Paddy , and has been used that way for generations in Ireland.
  • So when people shorten “St. Patrick’s Day,” they naturally say St. Paddy’s Day.

Think of it like “William → Billy” rather than “William → Willyum.” One follows tradition and sound; the other is just a guess.

2. Why “Patty” feels “wrong”

  • Patty in English is usually:
    • A nickname for Patricia , or sometimes for Patrick in American usage.
    • A word for a small flat cake of food, as in a hamburger patty.
  • There’s no historical or Irish linguistic link between St. Patrick and “Patty,” so to Irish people it sounds like calling it “St. Burger Day.”
  • Many Irish speakers and style guides specifically point out that “St. Patty’s Day” is an American mis-spelling that spread because it looks intuitive in English.

3. Paddy vs. Patty at a glance

[5][9][7] [3][5][9][7]
Spelling Main meaning St. Patrick’s Day use? Notes
Paddy Nickname for Pádraig/Patrick; also “rice paddy” (field) ✅ Correct: “St. Paddy’s Day” Traditional Irish nickname, rooted in Irish Gaelic.
Patty Small flat cake of food; nickname for Patricia ❌ Considered wrong by Irish speakers Sounds like a burger; arose mainly in US English.

4. Forum / “latest news” style context

Online every March, you’ll see reminder posts and memes saying “It’s Paddy , not Patty,” usually from Irish users slightly cringing at “St. Patty’s Day.”

Articles and blogs from Irish writers and culture sites keep repeating the same point: if you want to sound authentic or respectful to Irish tradition, use Paddy’s Day , not Patty’s Day.

“There isn’t a sinner in Ireland that would refer to a Patrick as ‘Patty’ – it’s as simple as that.”

5. Simple rule to remember

  • Talking about a burger or veggie patty? Patty.
  • Talking about St. Patrick or his day? Paddy.

TL;DR: It’s “Paddy” because it’s the real Irish nickname for Pádraig/Patrick; “Patty” is a food and a different name, so “St. Patty’s Day” sounds wrong to Irish ears.

Information gathered from public forums or data available on the internet and portrayed here.