Calan sits next to 5 phonetic neighbors — Caelan, Kalan, and Calen are the closest matches by sound. Most share Calan's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"first of the month, calends"
"foot soldier"
"the people"
"great, venerable"
"rye land, land of rye fields"
"little king"
"born of fire (via -vion creative suffix)"
"cultivator, earth worker"
"the river that swallows all rivers (from Zaire/nzadi)"
"deep blood-red color"
"gracious, merciful"
"the Lord is salvation"
"warrior in the field"
"new town"
"settlement of Holston, holly stone homestead"
"peaceful town"
"vigilant in battle (from Casey/Cathasach root)"
"deer meadow"
"wayfarer, wanderer"
"lord of the marches, border lord"
"hunting grounds"
Similar sound: These names share phonetic patterns with Calan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin via Welsh origins, giving them the same cultural heritage as Calan.
Rhythm: Calan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.