I'm almost certain Eupraxia was/is derived from Greek eu "good, well" and praxis too, so that name would mean something like "very active".
P.S. Praxis was also the name of Klingon moon that got accidentally blown up in Star Trek VI: The Undiscovered Country: http://memory-alpha.org/en/wiki/Praxis. I suppose an exploding moon of that size could be interpreted as "action", in a movie-going sense of the word. At least, it certainly looks cool!
Proud adopter of 15 punctuation marks; see my profile for their names.