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"
"God is gracious"
"honey, sweet"
"grace and beauty"
"free, from the lake"
"of Mars, the war god"
"modest, virtuous"
"fond of horses (philos + hippos)"
"may God protect"
"beautiful, lovely"
"earth, land, soil"
"bright, shining one"
"sun, sunlight"
"from Laurentum, laurel place"
"illustrious, renowned"
"sun goddess, solar"
"from the Priscus family"
"age, period of time"
"free one, woman from France/the Franks"
"gracious, dear, beloved (via Slavic mila)"
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.