The name Vatsko is of ancient Ukrainian origin and was first documented in 1570 in Mizhhirya, referring to a serf named Waczko Kalinicza. It is further mentioned in the Register of the Zaporozhian Cossacks in 1649. Genetically, the name Vatsko is related to the old Polish names Wacko and Wacek, as well as the Czech compound names Vaclav, Vaca, and Vacek. There are also surnames among the Transcarpathian Ukrainians, such as Vatsa, Vacik, Vatso, Vats, and Vatsko, which are derived from the names Vaclav or Vasyl. It can also be noted that the name Vatsko is connected to a 1552 record from Vinnytsia — Vachko Dryshcha, where the spelling was influenced by the Polish pronunciation of the softened sound "t". Additionally, in 1368, a town mayor named Vatsyuta from Lutsk is mentioned.
