Anthonia sits next to 4 phonetic neighbors — Antonia, Tonia, and Anthonette are the closest matches by sound. Most share Anthonia's Italian-origin cluster, so the rhythm and vowel shape carry across the list.
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Similar sound: These names share phonetic patterns with Anthonia — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Etruscan/Latin origins, giving them the same cultural heritage as Anthonia.
Rhythm: Anthonia is a 4-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.