Marcilla sits next to 4 phonetic neighbors — Marcella, Marcia, and Marcela are the closest matches by sound. Most share Marcilla's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"of Mars; dedicated to the god of war"
"famous, renowned"
"bliss, good fortune"
"Noble, honorable"
"riverside cliff dweller"
"heard by God"
"white winter fur of the stoat, purity and royalty"
"the letter V, symbolizing victory"
Similar sound: These names share phonetic patterns with Marcilla — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Marcilla.
Rhythm: Marcilla is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.