The Surname Lewchuk is of Ukrainian origin. It is composed of the root word "Lew" (Sometimes spelled "Lev") meaning 'Lion', and the Ukrainian diminutive suffix "Chuk" or "uk" meaning "son of" or "descendant of”. Thus, the surname Lewchuk can be interpreted as "son or descendant of Lew". Note: the Ukrainian diminutive suffix "Chuk" or "uk" meaning "son of" or "descendant of" is a very common way of composing Ukrainian surnames.
References
Lewchuk Wikipedia(Text) CC BY-SA