Lluvia sits next to 4 phonetic neighbors — Livia, Olivia, and Sylvia are the closest matches by sound. Most share Lluvia's Spanish-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"rain"
"from Ávila"
"watchpost, guard"
"bright, shining one"
"possibly linked to Deborah (Hebrew: bee)"
"honey, sweet"
"my delight, my pleasantness"
"grace, favor"
"Grace, favor"
"Italy, land of the Vitali (young cattle)"
"bright, luminous"
"of the sea, bitter sea (from Maria/Miriam)"
"noble protection"
"protector of mankind"
"God is gracious (via Gianna/Giovanni)"
"dear little Ana, gracious one"
"place by the sea (Moorish origin)"
"agile; nimble; skillful"
"evergreen; immortality"
"festivity, celebration"
"sky blue, azure color"
Similar sound: These names share phonetic patterns with Lluvia — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin pluvia via Spanish origins, giving them the same cultural heritage as Lluvia.
Rhythm: Lluvia is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.