Deja sits next to 4 phonetic neighbors — Deja (girl), Geja, and Raja are the closest matches by sound. Most share Deja's French-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"already; already seen"
"modern invented name; possibly derived from Toronto place name"
"the metal iron, element of strength and endurance"
"sacred place, holy enclosure"
"Branch; fern or bracken"
"raging flow"
"devoted to Demeter, goddess of harvest"
"God is gracious"
Similar sound: These names share phonetic patterns with Deja — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have French origins, giving them the same cultural heritage as Deja.
Rhythm: Deja is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.