Ondrej is a Czech variant of Andrew. Andrew originates in Greek language and means "virile, manly". In the New Testament, Andrew was an apostle and the first disciple of Jesus. Some sources suggest that the Greek name Andrew was actually just a nickname or a translation of the original Hebrew name of the apostle that is not known. As a masculine given name it started gaining popularity in the 1950s and currently it’s one of most popular names in the US.