Čierna is a village and municipality in the Trebišov District in the Košice Region of south-eastern Slovakia. The village's name comes from th…Čierna is a village and municipality in the Trebišov District in the Košice Region of south-eastern Slovakia. The village's name comes from the Hungarian personal name Csernő, or archaically, Cserna. The Ág- prefix is in memory of Agh, a local landowner mentioned in a 1270 record, where the village is called Chernafewld. The Slovak version of the name was created in 1948.