Radek m
Czech: pet form (with the diminutive suffix -ek) derived from a short form of any of the various Slavonic compound names containing the element rad glad, as for example Radimír (see RADZIMIERZ (SEE Radzimierz)) and Radoslav (see RADOSŁAW (SEE Radosław)).
Variants: Radík, Radko, Radoś, Radan, Radeček, Radoušek.
First names dictionary. 2012.