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"
"victory of the people (as short form of Nicholas)"
"sword, blade"
"the color blue"
"dark, swarthy (from Irish Dubhán)"
"powerful, excellent, good feeling"
"power of the people"
"brown one, the brown bear"
"modern invented name"
"peace-keeper, destroyer of enemies' glory"
"people's king"
"calm, serene"
"cloud"
"from the hollow farm"
"from the River Aire"
"surname used as given name"
"wolf power, strong guardian"
"knife, cutting blade of a plow"
"my God is the Lord"
"to guard, to protect"
"Winda's homestead, windy village"
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.