If you like the sound of "Mevendia", why not just use that? Although "me vendia" (with an accent on the i) means something in Spanish, and would be an odd name for a country, "Mevendia" doesn't mean a thing. It's not even pronounced the same (due to the lack of an accent mark). So, if you like it, use it; it's as good a made-up name for a country as any.

"Hold on, my friends, to the Constitution and to the Republic for which it stands. Miracles do not cluster and what has happened once in 6,000 years, may not happen again. Hold on to the Constitution" - Daniel Webster