Dianne sits next to 4 phonetic neighbors — Diana, Diane, and Dianna are the closest matches by sound. Most share Dianne's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"divine, goddess of the moon"
"from Paris; place of the Parisii tribe"
"one who summons, court summoner"
"the Jordan River"
"far-sighted"
"poet, verse-maker"
"joined, attached"
"fair-haired one from the clearing"
"Ever (always or eternal) plus Lea (meadow); eternal meadow"
"rival, eager to equal"
Similar sound: These names share phonetic patterns with Dianne — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Dianne.
Rhythm: Dianne is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.