While my previous long answer is the true origin - that I searched for made-up words that might fit the need until finding a good one – I've since learned that ZIB was also the name given to a stray dog that was drafted into the Soviet Space Program in September 1951, and flew a successful suborbital test flight:

http://en.wikipedia.org/wiki/Soviet_space_dogs#Bolik_and_ZIB

http://webecoist.momtastic.com/2011/04/05/bark-at-the-moon-a-history-of-soviet-space-dogs/

Thus I'm retconning the Zibcoin name as an homage to ZIB, the unlikeliest space mutt.

Without any formal preparation, I'm guessing ZIB got closer to the moon than any Shiba Inu. Attaboy, ZIB!

ZIB, we remember you.