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 Kehoe was born in 1972.
Colm Sheehan was born in 1942.
Colm Callan was born in 1923.
Colm Callan died in 2010.
Colm Honan was born in 1954.
Colm Murphy was born in 1952.
Colm Coyle was born in 1965.