How to pronounce Rocker?

Rocker
"Rock-er"
As in pronunciation of "Rock" rhymes with "Mock, Sock"

Last Name

German

Rooker, Roker, Rucker

A spinner of wool or a maker of distaffs.

English Rookers are descendents of the Stewards of the Tower of London . Chraged with keeping the Rooks (ravens-before the term became fixed for one specie) from leaving.
This is why the Rook chesspiece is tower shaped since usage of the Old english "Roche" for Castle would be unused by chess playing nobilty.