Asai sits next to 5 phonetic neighbors — Isaiah, Kai, and Sai are the closest matches by sound. Most share Asai's Japanese cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"morning glory, morning well (depending on kanji)"
"dark one, descendant of the dark one"
"noble, prince (from Arabic -mir)"
"son of Matthew"
"ocean wave, moving water"
"dark-haired one"
"guardian, watchman"
"flowing river"
"military commander"
"rye clearing, wood clearer"
"diamond"
"rust-colored, reddish-brown"
"one who understands, expert"
"truly brave, genuinely bold"
"from the fortified town"
"defender of men, protector of the people"
"ruler of the people"
"cloud"
"born of light"
"beautiful, handsome"
"warrior, earth ruler"
Similar sound: These names share phonetic patterns with Asai — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Japanese origins, giving them the same cultural heritage as Asai.
Rhythm: Asai is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.