Keenan sits next to 4 phonetic neighbors — Keanan, Kiernan, and Ciaran are the closest matches by sound. Most share Keenan's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"little ancient one"
"cheerful, optimistic"
"genuine, authentic, honest"
"stammering, lisping"
"modern invented name, possibly 'noble leader'"
"God is my strength, God will strengthen"
"salvation of God"
"divine, of Zeus"
"where the sun sets"
"Canaan, land of merchants"
"reminiscent of paladin (heroic knight)"
"crew, team"
"bearer of Christ"
"river (from Celtic afon)"
"one strength"
"king of birds (folkloric)"
"wide island"
"seeing clearly, sharp-sighted"
"long meadow, rocky meadow"
"of Mars, warlike"
"strip-shaped clearing in woodland"
Similar sound: These names share phonetic patterns with Keenan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Irish Gaelic origins, giving them the same cultural heritage as Keenan.
Rhythm: Keenan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.