Gavin sits next to 3 phonetic neighbors — Kevin, Calvin, and Devin are the closest matches by sound. Most share Gavin's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"white hawk of battle"
"God is gracious"
"Yahweh is God"
"from the surname Cauvin"
"wise person"
"colt herder, horse keeper"
"red earth, ground"
"little king"
"praised, thankful"
"dog (symbol of loyalty)"
"little seal"
"little warrior, war-associated"
"sea"
"one who mills grain"
"fair, white, bright"
"elevated, supreme"
"one who resembles God"
"feller of trees, hewer"
"opportunity, happenstance"
Similar sound: These names share phonetic patterns with Gavin — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Welsh origins, giving them the same cultural heritage as Gavin.
Rhythm: Gavin is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.