Addicus sits next to 3 phonetic neighbors — Atticus, Addison, and Marcus are the closest matches by sound. Most share Addicus's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"from Attica (Athens region)"
"eager, emulating"
"bright day of grace"
"echo, reverberating sound"
"Owner of the new house"
"cause of rejoicing"
"Root or foundation; also associated with radical and unconventional..."
"Pattern; model; example"
Similar sound: These names share phonetic patterns with Addicus — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Addicus.
Rhythm: Addicus is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.