Apparently those are names for 50 and 100 BTC.

From this presentation[1] or the source code[2]:

    1 Lovelace = 1 Bitcoin
    1 Goldwasser = 10 Bitcoin
    1 Rackoff = 25 Bitcoin
    1 Pedersen = 50 Bitcoin
    1 Williamson = 100 Bitcoin

But yes, those are meaningless names in themselves. Metric prefixes like "hectobitcoin" would be better.

[1]: https://sar.informatik.hu-berlin.de/teaching/2013-w/2013-w%2... [2]: https://github.com/Zerocoin/libzerocoin/blob/master/Coin.h#L...