Adamchik () is an East Slavic surname derived from the given name Adam.Ganzhina, p. 14 The Polish-language version is Adamczyk.
Notable people with the last name include: Andrus Adamchik, leader of the Apache Cayenne project Ed Adamchik (born 1941), American football player
References
Sources И. М. Ганжина (I. M. Ganzhina). "Словарь современных русских фамилий" (Dictionary of Modern Russian Last Names). Москва, 2001.