Mcclain sits next to 4 phonetic neighbors — McLean, Mclane, and McCain are the closest matches by sound. Most share Mcclain's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"son of the servant of Saint John"
"invented modern name, no established meaning"
"companion, friend"
"royal court attendant"
"manly, brave one of God"
"lucky, complete"
"son of David, from Hebrew Dodavahu (beloved)"
"Yahweh is gracious"
"ruler of the people"
"people's ruler"
"dweller by the red river crossing"
"eloquent, articulate (from Bayan)"
"Yahweh is God"
"war, strife"
"edge of a shield"
"joyful and calm"
"modern creative construction"
"victory of the people"
"curly-haired"
Similar sound: These names share phonetic patterns with Mcclain — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Scottish Gaelic Mac Gille Eathain origins, giving them the same cultural heritage as Mcclain.
Rhythm: Mcclain is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.