Gryffin sits next to 4 phonetic neighbors — Griffin, Griffith, and Gryphon are the closest matches by sound. Most share Gryffin's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"strong lord, chief"
"the kingdom of Ciar, County Kerry"
"noble born"
"heri (army) + beraht (bright)"
"trout (from the fish's spotted pattern)"
"one who sails, mariner"
"crooked nose"
"forest friend, house friend"
"speckled, variegated"
"willow farm, ledge estate"
"battle spirit, warrior"
"invented American name, possibly river (from Zaire)"
"the legendary smith (from Weland/Völundr)"
"broad hillside"
"of the moon, lunar"
"protector of mankind"
"bold, brave, daring"
"iron"
"son of Cole; victorious people"
"son of William"
"man of the forest"
Similar sound: These names share phonetic patterns with Gryffin — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Welsh origins, giving them the same cultural heritage as Gryffin.
Rhythm: Gryffin is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.