Dereck

Dereck is a spelling of Derek, a name connected through forms such as Diederik with the Germanic Theodoric family. Its older elements mean “people” and “ruler.” The route is Germanic and continental European; describing Dederick simply as an Old English original obscures that history.

Derek, Derrick, and Derick are the most useful spelling comparisons. Dereck adds a c before the final k while keeping the recognizable shape of the name. Basketball player Dereck Lively II is a contemporary bearer of this particular spelling. That public association is separate from the name's much older etymology, and a family's choice need not imply that the athlete was its inspiration.