Denver sits next to 4 phonetic neighbors — Denner, Decker, and Dexter are the closest matches by sound. Most share Denver's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"from the green valley"
"to tame, to subdue"
"handsome, cheerful"
"to heal"
"lying flat (large book)"
"little dark one"
"noble bright (adal + beraht)"
"sovereign, owner"
"Thor's stone"
"mortal, earthly"
"opportunity, happenstance"
"associated with the church"
"red-haired, little red one"
"helper, one who helps"
"son of the king"
"poet"
"masterless samurai"
"steadfast defender"
"little star"
"from the bridges"
Similar sound: These names share phonetic patterns with Denver — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have English origins, giving them the same cultural heritage as Denver.
Rhythm: Denver is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.