Alvenia sits next to 5 phonetic neighbors — Alva, Lavinia, and Elvinia are the closest matches by sound. Most share Alvenia's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"elf-friend, friend of elves"
"Possibly a diminutive of Genoveva (noble woman) or variant of Janel..."
"invented blend of classical sounds"
"fortune, riches"
"good, excellent"
"Dorian woman, from the Dorian people"
"God is gracious"
"noble, of noble kind"
"little bird"
"free woman (via Charlotte)"
"Praise, offering"
"good; well; true"
"modern variant of Majella"
"coal black, dark-complexioned"
"king"
Similar sound: These names share phonetic patterns with Alvenia — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English origins, giving them the same cultural heritage as Alvenia.
Rhythm: Alvenia is a 4-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.