The word "tepes" in Romanian means "impaler". This is the name given to Vlad Dracula, ruler of Wallachia, because impalement was his prefered and most famous form of execution.
Vlad Tepes (english: Vlad The Impaler) was the voievod (english: Ruler) of Tara Romaneasca (english: Wallachia).
He is commonly known as Dracula because he impaled people.