ウクライナ人民共和国軍
Oleksandr was born to a peasant family of Udovidchenko from Cherkassy volost, Liven uyezd of Orel Governorate that moved Kharkiv. His father served in the Russian Imperial Army earning a rank of colonel. His brother, Mykola Udovychenko, was a captain of the Russian Imperial Army and a khorunzhy general of the Ukrainian People's Army.