Keane sits next to 4 phonetic neighbors — Keen, Kane, and Kean are the closest matches by sound. Most share Keane's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"ancient, enduring"
"modern invented name"
"little dark one"
"raven warrior"
"new house"
"dark or fair (dual origin)"
"security token"
"rocky land, land of rock"
"spear, metalsmith"
"son of the renowned ruler"
"dark, full; complete darkness"
"symbol of wisdom and knowledge"
"blessed"
"God has heard"
"supplanter, held by the heel"
"powerful ruler"
"noble friend, old friend"
"hope, aspiration"
"victory of the people (through Nicholas derivation)"
"elf friend, friend of the elves"
"sword/fire (brand element)"
Similar sound: These names share phonetic patterns with Keane — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Irish cían origins, giving them the same cultural heritage as Keane.
Rhythm: Keane is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.