Joa sits next to 4 phonetic neighbors — Jo, Joe, and João are the closest matches by sound. Most share Joa's Portuguese-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"God is gracious"
"manly, strong"
"guest, stranger"
"God's precious gift"
"God will add, beloved"
"youthful, downy-bearded"
"from the heath, heathland dweller"
"exile, sojourner"
"noble and ready, prepared for battle"
"manly beauty, sun god"
"one who is led (possibly referring to blindness)"
"who is like God (Cuban variant of Michael)"
"rejoice, be happy"
"rock, stone"
"firebrand, sword blade"
"new house, bright place"
"bright north, famous northerner"
"showing clemency, forgiving"
"supplanter"
Similar sound: These names share phonetic patterns with Joa — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew via Portuguese origins, giving them the same cultural heritage as Joa.
Rhythm: Joa is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.