Caelum sits next to 3 phonetic neighbors — Callum, Caelem, and Kalum are the closest matches by sound. Most share Caelum's Latin-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"the carved one (alternate etymology)"
"God has remembered"
"son of Hays, hedged area"
"fair-haired one"
"son of Elijah"
"muddy farm or settlement"
"crooked nose, bent river"
"sea fortress"
"boundary gate"
"of the Chiel family"
"friend of God, beloved by God"
"rocky stream"
"industrious, striving"
"from Airelle (a place in Normandy)"
"lord, master"
"youthful, downy-bearded (first beard)"
"raven, crow"
"son of the home ruler"
"invented modern name, no classical meaning"
"of the eighth"
Similar sound: These names share phonetic patterns with Caelum — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Caelum.
Rhythm: Caelum is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.