Royce sits next to 4 phonetic neighbors — Joyce, Brice, 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 Roy, descendant of the king"
"remarkable story, myth"
"from the River Slane area"
"the beloved, darling"
"high, exalted, sublime"
"pastoral paradise (from Greek Arcadia)"
"of the heavenly sky"
"beloved, darling"
"mountain of strength"
"free woman, petite"
"twin"
"captivating beauty (ensnaring)"
"from the marshes"
"little king, ruler"
"hazel tree by the woodland clearing"
"place of elms, elm grove"
"flower garland, grace"
"lion-like (possible Turkic influence)"
"noble, exalted"
"French diminutive feminine form of Ariel or Gabriel root"
"modern invented name, meadow variant"
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/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.