Avsey
Avsey () is a Russian male first name. There are several theories as to its origins. According to one, it is simply a colloquial variant of the name Yevsey. Another possibility is that "Avsey", as well as Asey () and Osey (), are colloquial variants of the name Absey (), alternatively spelled Apsey (), which until the end of the 19th century was included into the official Synodal Menologium. Finally, it is possible that "Avsey" derives from the Old East Slavic word "авсень"/"овсень" (avsen/ovsen), meaning New Year's Eve, which in ancient times corresponded to the first day of spring.

The diminutive of "Avsey" is Avseyka ().

The patronymics derived from "Avsey" are "" (Avseyevich; masculine) and its colloquial form "" (Avseich), and "" (Avseyevna; feminine). The patronymics derived from "Absey" are "" (Abseyevich; masculine) and "" (Abseyevna; feminine).