Kalum sits next to 3 phonetic neighbors — Callum, Calum, and Malcolm are the closest matches by sound. Most share Kalum's Scottish cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"dove"
"wonder, miracle, something astonishing"
"protective covering of a flower bud"
"open land, cleared field"
"hay valley, hedged valley"
"bold land"
"settlement on a hill"
"little fire, born of fire"
"spear wood (ash was used for spears)"
"sword (card suit origin)"
"modern coinage, no historical meaning"
"son of Agnes (pure, holy)"
"royal court attendant"
"bright new home"
"maple tree"
"well-born (through Owen/Eugenius)"
"from the place of the sturgeon"
"large meadow settlement"
"whole, universal"
"ash tree farm, settlement by ash trees"
Similar sound: These names share phonetic patterns with Kalum — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Scottish Gaelic/Latin Columba origins, giving them the same cultural heritage as Kalum.
Rhythm: Kalum is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.