Say It Right: Samhain
How to say Samhain — it is "SOW-in" (rhymes with cow-in), not "Sam-hane." Why the mh trips everyone up.

This is the one that trips up almost everyone at Halloween. Samhain is not “Sam-hain” or “Sam-hane.” In Irish it is said roughly “SOW-in” — the first syllable rhyming with “cow,” the whole thing in two beats with the stress up front. You will also hear “SAH-win” in some dialects, which is close enough to pass.
The pitfall is the mh. In Irish, mh is not an “m” sound at all — it softens to a “w” or “v.” So the letters you see (“s-a-m-h-a-i-n”) map onto sounds that look nothing like the spelling to an English eye. The trick is to ignore the m and h as separate letters and let them blur into that “ow” glide.
Meaning: in modern Irish, Samhain is simply the name of the month of November, and by extension the festival at the start of it. Popular writing loves to translate it as “summer’s end,” but linguists treat that as a folk etymology; the honest gloss is “the start of winter.”
Mispronunciations to avoid: “SAM-hain,” “SAM-hane,” “sam-HAYN.” None of them are how the word is said in Ireland. If you remember one thing, make it this: the first syllable sounds like sow (a female pig), not like the name Sam.
Where it comes from: Old Irish samain, a Gaelic quarter-day whose name-root goes back to Proto-Celtic and appears even on the Gaulish Coligny calendar as Samonios.
A memory trick: picture a sow — a female pig — and add “-in.” “SOW-in.” Say it a few times and the spelling stops fighting you.
Why does the writing look so unlike the sound? Because Irish spelling faithfully records a sound-system with rules English does not share. The pairing mh (and its cousin bh) represents a soft “w” or “v,” a feature called lenition. Once you know that one rule, a whole shelf of Irish words stops looking like a trap and starts looking regular.
You will hear small regional differences — “SAH-win” and “SOW-un” both circulate across Irish dialects — and all are far closer to the mark than the hard “Sam-hane” of the horror-film trailer. If you are ever unsure in company, “SOW-in” is the safe, widely understood choice. Say it with a little confidence: you are now pronouncing it more accurately than most of the internet each October.