Keyan sits next to 5 phonetic neighbors — Kian, Cian, and Keanu are the closest matches by sound. Most share Keyan's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"ancient, enduring, long-standing"
"God is gracious"
"son of Hendrik"
"pleasant stream"
"hedgerow, boundary"
"of Mars, warlike"
"God, divine"
"father of strong men"
"God will strengthen, God strengthens"
"lord of the marches, border lord"
"one of free status"
"living water, strength"
"realm of the dead"
"beloved"
"son of Rollin, son of Roland"
"hunting grounds"
"Yahweh has shown favor"
"my God is light"
"modern invented name with energetic sound"
"one who tells, narrator, counter of money"
"work-power, industry"
Similar sound: These names share phonetic patterns with Keyan — 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 Keyan.
Rhythm: Keyan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.