there is no other coin pronounced exactly like Cryptonite
There are (at last count) THREE other coins pronounced and/or spelled exactly like Cryptonite. Two are dead, one is very much alive.
I'm shocked there is not yet a 'KryptoNight' and 'CryptoKnite.' Well, give it a day or two and they will pop up...
Kryptonite - https://bitcointalk.org/index.php?topic=606682.0
Cyptonite - https://bitcointalk.org/index.php?topic=700039.0
CryptoKnight - https://bitcointalk.org/index.php?topic=274766.0
Now you clearly have to change your vote to MiniCoin.
I say lose the "coin" part and call it MicroChain or MicroNite 
I'm OK with 'MiniChain' but having a '-coin' suffix is an advantage. We play with coins as children and this grounding experience provides a rich conceptual field from which we can create metaphors to apply to non-physical crypto currencies. It's also nice to share/inherit the BitCoin family naming convention.
A name like "Crypton" does not invoke that very descriptive and useful 'coin' schema/vocabulary. Plus it sounds like the crappy old unstable planet where Superman's family and entire race (minus Zod and Supergirl) died horribly.