carp (n.) Look up carp at Dictionary.com
"fish," 1393, from O.Fr. carpe, from V.L. carpa (c.575), possibly from Gothic *karpa. A Danube fish (hence the E.Gmc. origin of its name), introduced in Eng. ponds 14c.
carp (v.) Look up carp at Dictionary.com
"complain," c.1240, from O.N. karpa "to brag," of unknown origin; meaning turned toward "find fault," probably by infl. of L. carpere "to slander, revile," lit. "to pluck" (see harvest).