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"
"the Lord's house; a place of Christian worship"
"perfect joy, supreme happiness"
"cotton plant, soft white fiber"
"old friend, noble strength"
"yarrow plant"
"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.