Caelus sits next to 4 phonetic neighbors — Caelum, Kai, and Cael are the closest matches by sound. Most share Caelus's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"sky, heaven"
"thorny bush, briar plant"
"burnt wine, distilled wine"
"raven, crow"
"great, fruitful"
"desert fox"
"priceless one, beyond praise"
"reward, recompense, prize for valor"
"ruler of the people"
"lion-like (from Llewelyn)"
"from Alba (the white city)"
Similar sound: These names share phonetic patterns with Caelus — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Caelus.
Rhythm: Caelus is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.