Ondřej is a masculine given name of Czech origin, derived from the Old Slavic element 'ondra', meaning 'warrior' or 'valiant'. It is composed of the elements 'on-', meaning 'powerful', and '-drja', which means 'people' or 'strength'. The name was quite popular among the early rulers of Bohemia. Notable individuals with this name include Ondřej Sosenka, a Czech poet and translator, and Ondřej Duda, a Czech cyclist.
"Ondrej saw a rise in popularity between 2003 and 2008, with 8 babies named Ondrej born in the latter year compared to just 6 in the former."