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"
"legendary king of Phrygia, golden touch"
"joyful, jovial (from the same root)"
"God is gracious, Yahweh is gracious"
"peace (folk etymology)"
"king's town"
"rocky outcrop, tor"
"supplanter (via Jacob/Kobe etymology)"
"chief, royal descendant"
"dweller near ash trees"
"forest, woodland"
"auspicious, favorable"
"courtesy, respect, gratitude"
"tranquility, harmony"
"bright, shining, evident"
"descendant of fire, young warrior"
"safe haven, shelter, refuge"
"industrious ruler"
"teacher, learned one"
"light refreshing wind"
"one who strides, walks with purpose"
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.