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"
"large homestead, settlement (via Trevor)"
"noble spear (Edgar-derived)"
"Geirrapos island, grassy island"
"brave one, bold and courageous"
"little fire"
"slender, narrow"
"of the forest, woodland"
"peaceful ruler"
"red-haired, from the russet one"
"place name: from Kelton"
"prince, king"
"lover of the earth"
"broad valley"
"calmness, depth, trust"
"bright fame"
"rye grain"
"defender (Greek mythological meaning)"
"crossroads, cross"
"nature name: rivers, waterways"
"lake of the sage Kashyapa (Sanskrit etymology)"
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.