The Ukrainian name Zhadko is derived from the verbal root "zhadaty," which means "to demand" or "to insistently ask." It is recorded in medieval graffiti of St. Sophia's Cathedral in Kyiv.In 1545, the name Zhadko appears in a description of the residents of Zhytomyr Castle as Żadko Olszanikowicz. In the description of Cherkasy Castle, there are three individuals named Zhadko: Zhadko Pozhoga, townsman Zhadko Nalytnievych, and townsman Zhadko Kruhlo-vych.In the Register of the Zaporizhian Army from 1649, in addition to records of a Cossack from the Kaniv Regiment named Zhadko, there are variations of the name Zhadko and Zhadzko. For example, Zhadko Andriyivych, Zhadko Surynynko from the Kaniv Regiment, and Zhadko Bazhanenko from the Kalnytsky Regiment. Paternal names of Cossacks from the Kaniv Regiment in 1649 include Bohdan Zhadchenko and Denis Zhadchenko from the Kyiv Regiment.In Ukraine, the specific name Zhayvoronok has not been identified, but there are recorded anthroponyms, particularly patronymics and surnames formed from it. For instance, in 1400, it is mentioned "selling to Mr. Klius the household of Zhavoronkovych" in the city of Lviv. In 1649, Cossack Ivan Zhayvoronok is mentioned, and in 1674 - Yashka Ivanovych Zhavoronkov from the Holmsky district.The name Zhavoronok is also recorded in Russia in 1554: Zhavoronok Lazorev - a servant of the Volotsky Monastery. Additionally, there is a record from Poland in 1440: Testes Żawronek Iurko.