Alexa sits next to 5 phonetic neighbors — Alexia, Alexandra, and Lexa are the closest matches by sound. Most share Alexa's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"defender of mankind"
"mighty in battle"
"lake + lake (Welsh llyn)"
"goddess of flowers and spring"
"modern invented name"
"dark, rich (possibly referring to the dark Adriatic waters)"
"my God is Yahweh, the Lord is my God"
"Ceol's island, ship island"
"solemn commitment"
"from the oak wood"
"farmer, earth-worker"
"with a web over her face"
"olive"
"beautiful"
"throne, sun (alternate Persian/Greek etymology)"
"mill worker, grinder"
"lily of grace"
"agreement, concord, fitting together"
"new, fresh, pure"
"brightness, lustrous"
"one who lives near the castle outer wall"
Similar sound: These names share phonetic patterns with Alexa — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Alexa.
Rhythm: Alexa is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.