Eoin sits next to 4 phonetic neighbors — Owen, Ian, and Evan are the closest matches by sound. Most share Eoin's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"God is gracious"
"steward, estate guardian"
"from Bryans land"
"hedgerow, boundary"
"from the oak grove"
"possessor of good"
"archway, structural arch"
"God is gracious"
"dark warrior, little dark chieftain"
"slender, narrow"
"from the fortress"
"yellow, slender"
"cleric, church official"
"red-haired fighter"
"son of the devotee of Saint Fillan"
"from Arcy, Norman town"
"descendant of the dark-eyed one"
"holy one (of Dewi/David)"
"cloud"
Similar sound: These names share phonetic patterns with Eoin — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew origins, giving them the same cultural heritage as Eoin.
Rhythm: Eoin is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.