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Worldwide, Vatslav (Вацлав , Вацлаў , Ватцлав ) is quite a rare boy's first name. The first name Vatslav is habitual in Ukraine, where it is quite a rare masculine name, Kazakhstan, and Lithuania. Measured by absolute frequency, the name is most common in Russia, Ukraine, and Kazakhstan. Much less frequently, Vatslav is the last name as well as the forename.
Vatslav is also a name for the fictitious and mythical characters: Wacław Wareda and Wacław Milczek , character in Zemsta.