Finnian sits next to 4 phonetic neighbors — Finn, Finnan, and Finnegan are the closest matches by sound. Most share Finnian's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"fair, white, bright"
"myrrh, fragrant oil"
"son of Anne, son of Agnes"
"Gomeric's hill"
"shelter, protection"
"son of Peter (son of the rock)"
"of the sea, of the lake"
"sacred, belonging to the divine"
"my messenger, my angel"
"stone worker"
"dark, swarthy"
"crooked hill"
"divine, god"
"eagle power, eagle ruler"
"supplanter, may God protect"
"light, happiness (Ko in Japanese)"
"wealthy guardian"
"the Nubian, the southerner"
"son of Adam"
"impulsive, little king"
"name of God"
Similar sound: These names share phonetic patterns with Finnian — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Irish origins, giving them the same cultural heritage as Finnian.
Rhythm: Finnian is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.