Gretta sits next to 4 phonetic neighbors — Greta, Gretel, and Berta are the closest matches by sound. Most share Gretta's German-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"pearl"
"pure, clean"
"hunter, rising in the sky"
"courageous, valiant"
"made from kermes insect dye"
"possibly high chief (via Hawaiian Ailani)"
"modern invented name"
"healing herb, health"
"thorny plant, wild rose"
"modern invented name, meadow variant"
"form of Michael/Micaiah"
"rhythm, musical flow"
"from the hay hill, heath dweller"
"beloved, friend"
"exalted by God"
"member of the Gaut tribe"
"thankful; God has heard"
"flat open land"
"from Asia, of the East"
"short form of Josephine"
"gift of God"
Similar sound: These names share phonetic patterns with Gretta — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek via Latin and German origins, giving them the same cultural heritage as Gretta.
Rhythm: Gretta is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.