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"
"variant of John"
"surname used as given name"
"dark, full; complete darkness"
"God has bestowed, gift of God"
"strong flow, powerful surge (river etymology)"
"brave traveler"
"raven warrior"
"pledge, oath, measure"
"elf friend, friend of the elves"
"modern blend of Waylon and Lynn"
"from the gray hill"
"fair warrior, fair hero"
"unit of luminous flux (scientific)"
"enclosed woodland"
"son of Cole (son of Nicholas)"
"bold ruler"
"bought land, purchased territory"
"of Tyre, the ancient city"
"supplanter, held by the heel"
"from the ash tree grove"
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.