Long sits next to 3 phonetic neighbors — Ron, Hong, and Dong are the closest matches by sound. Most share Long's Chinese cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"dragon, power, prosperity"
"son of David, son of the beloved"
"one who tills the land, farmer"
"geographic name from ancient Gaulish"
"khan, leader of a tribe"
"son of Mart (Martin)"
"salvation, God saves"
"place of the elms"
"the river that swallows all rivers (from Zaire/nzadi)"
"foreigner, of the Welsh"
"modern American creation (Trevor root: large homestead)"
"God is gracious, Yahweh is gracious"
"champion, cloud"
"mighty hound, great wolf"
"spear ruler"
"great homestead, large settlement"
"to rejoice, happy, glad"
"devoted to Demeter"
"the Lord recalled"
"wise and powerful"
Similar sound: These names share phonetic patterns with Long — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Chinese/Vietnamese origins, giving them the same cultural heritage as Long.
Rhythm: Long is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.