While not obvious, it is possible to find all monks with 'mint' in their usernames.

Every monk has a homenode. Homenodes are of type 'user' and have a title of $monkname. Therefore, if you super search on "Match titles containing: mint" and "Search only section: Users", you should get what you want:

Pmint
adominte
stmintz
MintyFresh
Figmint
supermint
mint1981

-Blake