Tiso is a rare yet distinctive Slavic given name, popular among Bulgarians and Slovaks. It's derived from the Slavic element "tisla", meaning 'strength' or 'power'. Historically associated with 9th-century Frankish king Pepin I (also known as Tisso), it is more commonly used for males despite some cultures considering it unisex due to its short length and simple sound. Notable figures include 20th-century Slovak sculptor Tiso Kolesár.