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"
"magic dignity"
"who is like God?"
"from Laurentum, crowned with laurel"
"strong as a lion"
"dear one of God"
"sun, throne"
"modern creative variant of Zaire"
"son of the blessed one"
"title of honor, great one"
"eagle"
"animal enclosure, warren"
"breath, vapor, impermanence"
"bright, splendid"
"Gaelic speaker"
"Poecc's estate; Poecc's settlement"
"money box, treasury"
"alert, watchful, vigilant"
"protector of people"
"sorrowful (folk etymology via French)"
"red"
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.