Dennis sits next to 4 phonetic neighbors — Denis, Denny, and Dean are the closest matches by sound. Most share Dennis's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"follower of Dionysus"
"wild rose bush"
"peddler, pack-horse driver"
"brook, small stream"
"renowned warrior"
"ruler, sovereign"
"gift of God"
"powerful leader of the folk"
"brown, dark-complexioned"
"ash tree settlement"
"lives near a bridge"
"renowned warrior"
"God has remembered"
"son of Nicholas (via Cole)"
"fifth, born fifth"
"good, blessing"
"ruler of the world"
"sandalwood tree"
"chief desire"
"son of Ridge"
"short form of Wesley or Weston"
Similar sound: These names share phonetic patterns with Dennis — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Dennis.
Rhythm: Dennis is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.