Rosario sits next to 4 phonetic neighbors — Rosaria, Rosalie, and Rosa are the closest matches by sound. Most share Rosario's Spanish-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"rosary, garland of roses"
"violet flower"
"gracious, dear, beloved (via Slavic mila)"
"follower of Christ"
"bright, shining one"
"ancient, enduring"
"place of the Prophet, radiant city"
"of the sun, sunlit"
"little Antonia, beloved one"
"port, harbor"
"age, period of time"
"honor, fame"
"feminine form of Charles/Carlos"
"rule, standard"
"noble one, of noble kind"
"comely, lovely"
"song, poem"
"from Hadria (city near the Adriatic Sea)"
"ancient, venerable, of old times"
Similar sound: These names share phonetic patterns with Rosario — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Spanish/Latin origins, giving them the same cultural heritage as Rosario.
Rhythm: Rosario is a 4-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.