Family name วิชัยศักดิ์ (วิชัยศักดิ์ 
, Wichaisak ) , globally, is a very rare surname. The surname วิชัยศักดิ์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. More frequently, วิชัยศักดิ์ is the forename as well as the last name.