Dean sits next to 3 phonetic neighbors — Dane, Deen, and Dion are the closest matches by sound. Most share Dean's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"church official overseeing ten"
"strong as a lion"
"light of heaven"
"son of the south"
"treasurer, keeper of treasure"
"citizen of Rome, Roman"
"ever ruler, eternal king"
"son of Harry (Henry)"
"From Hebrew 'Yaakov'; the biblical patriarch who wrestled with an a..."
"stone"
"lion"
"hollow (place)"
"firm foundation"
"warrior, brave one"
"son of Carr (marsh dweller)"
"people's champion, victorious"
"round barrel, lump"
"swift, alert"
"born of fire"
"story to be read, remarkable person"
"dog (symbol of loyalty)"
Similar sound: These names share phonetic patterns with Dean — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin decanus origins, giving them the same cultural heritage as Dean.
Rhythm: Dean is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.