Ilcia sits next to 4 phonetic neighbors — Alicia, Ilya, and Felicia are the closest matches by sound. Most share Ilcia's Spanish-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"noble, of noble kind"
"sunrise, east"
"Bright, shining; blessed"
Similar sound: These names share phonetic patterns with Ilcia — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic origins, giving them the same cultural heritage as Ilcia.
Rhythm: Ilcia is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.