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"
"maiden, girl"
"fairy, enchanted being"
"heavenly, of the sky"
"divine, godly"
"fire, grain of fire (Gaelic Eithne)"
"box tree meadow"
"made of steel"
"triumphant one"
"calm, peaceful waters"
"feminine form of Darian/Darius"
"strong-willed protector"
"hazel tree meadow"
"joyful"
"supplanter, one who follows at the heel"
"my God is an oath, pledged to God"
"mirth, merriment, great joy"
"uncertain Egyptian origin"
"thankful, one whom God hears"
"hazel tree by the woodland clearing"
"radiant, shining"
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.