Dennon sits next to 3 phonetic neighbors — Denton, Lennon, and Brennan are the closest matches by sound. Most share Dennon's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"from the valley settlement"
"Creek or stream; phonetic variant"
"fate, destined path, divine purpose"
"broom-covered hill"
"free man, manly"
"modern variant possibly related to 'bull' (Taurus) or 'morning star..."
"one who lives near a bend; from the bend"
"son of David, beloved son"
"dark, rich"
Similar sound: These names share phonetic patterns with Dennon — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English origins, giving them the same cultural heritage as Dennon.
Rhythm: Dennon is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.