The name 'Lesko' is obviously a diminutive form with the suffix -ko, derived from Ukrainian names such as Oles or Oleksiy. This name may also have originated from the shortening of the ancient Slavic two-component names Lʹstyslav or Lʹstimir, where the initial part contains the verb 'lʹstity', meaning 'to please'. For example, in the Polish language, there is a word 'leść', which means 'betrayal, deception'.Thus, the name 'Lesko' could have also arisen from the ancient Lʹstʹko, mentioned in documents from the year 1228. In particular, one of the documents states: "make peace with Lʹstʹko and with the Comans." According to Ostash, in the Register of the Zaporizhian Cossacks from 1649, 468 Cossacks were registered under the name Lesko. Among them were Cossacks of the Myrhorod regiment: Lesko But, Lesko Tomchenko, Lesko Nesterenco, as well as Cossack Lesko Lopatetsky from the Nizhyn regiment and Cossack Lesko Radchenko from the Korsun regiment.The name 'Lesko' is also mentioned in documents from various years: in 1660, Cossacks Lesko Vasylenko and Lesko Serheyenko bore this name, and in 1669 — Lesko Lokotʹ, the chief officer of the Pereyaslav regiment.