You would pronounce it like Cullum.
kol-um toe-bean with the accent on the kol and the bean
"Colm" is typically pronounced as "colm," rhyming with "palm." In Irish, it is often pronounced with a slightly softer "c," sounding like "kawl-m," but the first syllable is more commonly pronounced as "colm" in English-speaking contexts.
Colm Whyte is the other name.
Colm Magner is 6'.
Scottish: Calum the Irish equivalent is Colm (pronounced kullum).
Colm Callanan was born in 1982.
Colm Coyle was born in 1965.
Colm Byrne was born in 1971.
Colm Doran was born in 1949.
Colm Parkinson was born in 1978.
Colm Brogan was born in 1902.
Colm Murphy was born in 1952.