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"
"he gave, gift from God"
"God's gift"
"virile one"
"Roman pilgrim"
"firm foundation"
"wise protector"
"magic dignity"
"battle"
"God is gracious (via Jack, from John)"
"soldier"
"priest"
"born of fire"
"army man, soldier"
"one who lives near a brook"
"the victorious, the conqueror"
"from the Stetson hat-making family"
"deer lover, champion warrior"
"strengthened by God"
"people's champion, victorious"
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.