Colm sits next to 4 phonetic neighbors — Callum, Colum, and Colin are the closest matches by sound. Most share Colm's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"dove"
"little wolf"
"little dark one"
"holy, divine"
"from Erroll, Scotland"
"the genuine article"
"form of Eleanor/Helen meaning 'torch'"
"dwelling by the stream"
"dark one"
"one island, isolated place"
"Red-haired"
"descendant of Raghallach"
"from Laurentum (laurel city)"
"handsome, beloved"
"from the Afton river"
"bear of the gods"
"supplanter"
Similar sound: These names share phonetic patterns with Colm — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Irish origins, giving them the same cultural heritage as Colm.
Rhythm: Colm is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.