Grecia sits next to 4 phonetic neighbors — Grecia, Gloria, and Graciela are the closest matches by sound. Most share Grecia's Spanish-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"referring to Greece (ancient civilization)"
"holy, sacred"
"gift of Isis"
"of the Antonius family"
"sky altar, celestial altar"
"beloved, little Mary"
"descended from Jupiter"
"blue"
"Scotland (in Scottish Gaelic)"
"member of the Gauts tribe"
"she who entangles men"
"clear, evident"
"precious crystalline water"
"dedicated to Mars"
"noble father's daughter"
"strength, valor"
"protector of humanity"
"pearl"
"heaven, sky"
"utterly pure"
Similar sound: These names share phonetic patterns with Grecia — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin Graecia via Spanish origins, giving them the same cultural heritage as Grecia.
Rhythm: Grecia is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.