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)"
"runner, messenger"
"God has given (via Nathan blend)"
"father of strong men"
"lake dweller, one from the lake"
"neighbor, dweller"
"dark, coal-black"
"fort at Luguvalium"
"by the brook"
"from the Leyden region"
"my God"
"creative American original"
"God exalts"
"son of John"
"modern American blend with -von suffix"
"high and mighty, chief"
"eighth"
"speckled, freckled"
"son of John (God is gracious)"
"fortunate, of good fortune"
"may God give strength"
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.