Callum sits next to 4 phonetic neighbors — Calum, Colin, and Calvin are the closest matches by sound. Most share Callum's Scottish cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"dove"
"beautiful, lovely"
"prosperity, grace"
"from Tennyson, little Tenne"
"star maiden, starry one"
"orange tree, fragrant orange blossom"
"God is gracious, divinely gifted"
"new star, new sky"
"from Seville"
"Midwinter feast, Christmas season"
"God is my oath (from Lisa/Elizabeth)"
"loved by God, gift of God"
"of the father; belonging to God"
"from Évreux (place in Normandy)"
"grace, beauty"
"pearl of the meadow"
Similar sound: These names share phonetic patterns with Callum — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Scottish Gaelic origins, giving them the same cultural heritage as Callum.
Rhythm: Callum is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.