What is "eudoxia"

Eudoxia (, Eudoxía), Eudokia and Eudocia (, Eudokía) or Evdokia is a feminine given name, which originally meant "good deeds" in Greek. The Slavic languages know a few forms of the name – East Slavic: Евдокия, Evdokiya; , Yevdokiya. It was mainly popular in late antiquity and during the Middle Ages, particularly in Eastern Europe. It continues in use today, usually in honor of various saints.

For Russians named Avdotia look there.

Eudoxia, Eudocia or Eudokia are versions of an originally Greek name. Variations in other languages include Evdokia, Evdokija, Evdokiya, Avdotya, Avdotia etc.
The name and its derivates have also been used for geographical locations and at least one ship, among other things.
For all these meanings, see:

• Eudoxia (name)