Boy sits next to 4 phonetic neighbors — Bowie, Bou, and Beau are the closest matches by sound. Most share Boy's Filipino-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"young male, beloved son"
"from Rome, Roman person"
"flowing"
"from the Cassius Roman family clan"
"fox-colored"
"little one, junior (Vaughn element)"
"excellent, authentic (slang)"
"Yahweh is my God"
"fiery one"
"mythical bird of rebirth"
"light, illumination"
"descendant of the peaceful one"
"brave, vigorous power"
"gift of God"
"God-like, incomparable"
"of the court, refined"
"ray of light + God is gracious"
"devoted one, passionate admirer"
"from Athens"
"mighty as a bear"
"modern coinage; possibly day-bright valley dweller"
Similar sound: These names share phonetic patterns with Boy — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Filipino origins, giving them the same cultural heritage as Boy.
Rhythm: Boy is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.