"Kamen" (the sress is on the "a") is a Bulgarian masculine name connected with the Greek "Petros". "Kamen" has a Slavonic origin and means the Bulgarian word "kamenen", which means "stone" (as an adjective). "Kamen" was created as a translation of "Petros" ("petros" means "stone" (as a noun) in Greek). The feminine form of "Kamen" is "Kamena" (the stress is on the "e"). "Kamen" and "Kamena" have a nameday on 29th June - the day of St Petar and St Pavel (the English names are respectively St Peter and St Paul).