Maddex sits next to 4 phonetic neighbors — Maddox, Maddux, and Mattox are the closest matches by sound. Most share Maddex's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"fortunate, of good fortune"
"young warrior"
"peace-keeper, destroyer of enemies' glory"
"prince, noble one"
"one who lives by a stile"
"beautiful gaze"
"of the Saxon people"
"horse keeper, stable master"
"miracle of God"
"one who defies authority, resister"
"steward, estate guardian"
"the sea belongs to God"
"handsome, well-born"
"oak lake"
"dark one, little dark-haired one"
"desired, longed for"
"shining, bright, luminous"
"lordly, master (via Cyril)"
"measured flow, regular beat"
"warrior of life"
Similar sound: These names share phonetic patterns with Maddex — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Welsh origins, giving them the same cultural heritage as Maddex.
Rhythm: Maddex is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.