Caldwell sits next to 5 phonetic neighbors — Caldwell, Colwell, and Maxwell are the closest matches by sound. Most share Caldwell's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"cold well; from the cold water source"
"enduring, lasting (via Dante)"
"possibly from Celtic 'avon' (river)"
"to tame, subdue"
"from Airelle (place in Normandy, France)"
"son of Braxton"
"dawn, new beginning"
"to cry out, a wolf's cry"
"gift of God"
"downy-bearded, youthful"
"good, virtuous"
"possession, acquired"
"growth and abundance (via Zaid root)"
"descendant of the dark challenger"
"vigilant, watchful"
"God has remembered"
"water sprite, water spirit"
"of the forest, from the wood"
"of or relating to an epic poem"
"bright valley"
Similar sound: These names share phonetic patterns with Caldwell — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English origins, giving them the same cultural heritage as Caldwell.
Rhythm: Caldwell is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.