Royce sits next to 4 phonetic neighbors — Boyce, Roy, and Bryce are the closest matches by sound. Most share Royce's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"son of the king"
"morning"
"to heal (from iasthai)"
"from Brix (place name)"
"high-spirited person"
"dark warrior"
"who is like God"
"modern American invention"
"hunter, one who hunts"
"God is gracious (via John/Zane)"
"dark man's settlement, coal-black farm"
"seven; divine completion"
"lion-like, brave"
"narrow channel's son"
"divine healer"
"birth, nativity"
"Yahweh remembers"
"selected, set apart, elected"
"record keeper"
"strength, manly beauty"
"rising in the sky, boundary"
Similar sound: These names share phonetic patterns with Royce — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old French via English origins, giving them the same cultural heritage as Royce.
Rhythm: Royce is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.