"Variant of Alexander"
The name Aleks is commonly a male name from the "Greek" origin.
Aleks is a variant of Alexander, and in Estonian, Polish, Slovene, Swedish, Norwegian and Finnish it serves as the short form of Aleksander. It is a distinct spelling of a long-established name rather than a separate coinage, and it carries no meaning of its own beyond that of the name it shortens.
Alexander means "Defender of humankind. A form of Alexander|From the beach.".
The pronunciation of Aleks is AL-eks.