Kallum sits next to 4 phonetic neighbors — Callum, Calum, and Malcolm are the closest matches by sound. Most share Kallum's Scottish cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"dove"
"son of Thomas, son of the twin"
"battle, fighter"
"servant, worshipper of God"
"fair-skinned, son of the fair one"
"linden tree hill"
"rocky outcropping, cliff dweller"
"deep blue color"
"from the kaupa (trading) land"
"from the steep place"
"town near the cliff"
"people's lord"
"dark, black-haired"
"tempest, violent storm"
"sun, lord"
"remnants of the lake"
"from the bailey (castle wall)"
"peaceful ruler"
"well-born, of noble descent"
"a large inland body of water"
"champion, cloud"
Similar sound: These names share phonetic patterns with Kallum — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Kallum.
Rhythm: Kallum is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.