Vivien sits next to 5 phonetic neighbors — Vivian, Julian, and Damien are the closest matches by sound. Most share Vivien's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"full of life, lively, alive"
"old friend, noble strength"
"gentle, kind"
"rough stream"
"cotton plant, soft white fiber"
"the Lord's house; a place of Christian worship"
"cause of rejoicing"
Similar sound: These names share phonetic patterns with Vivien — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin (vivus via Vivianus) origins, giving them the same cultural heritage as Vivien.
Rhythm: Vivien is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.