The Slavic personal name "Selko" originates from the anthroposystem that underlies Ukrainian names such as "Selyan," "Selik," "Selim," as well as Croatian names like "Selo," "Seiko," "Seljo," and "Selimir." In the Serbian language, there are variants "Selko" and "Selibor." The name "Seiko" is recorded in 1552 in the city of Zhytomyr. Additionally, the name "Selko" can be found in the patronymic of the Cossack Hapon Sylchun, who came from the Pereiaslav regiment in 1649. The ending "-ko" is characteristic for the formation of similar names.