Initialism of also known as.
"The band's original name, The Shadows, is often listed on older albums as their stage name or aka."
In plain English: Aka is short for also known as and means something else that refers to the same thing.
"That movie is also known as aka The Wizard, but people usually just call it by its original name."
Alternative letter-case form of AKA
"The acronym was written in all caps as AKAs and also appeared in mixed case as akas within the same document."
Either of two lakes in Alaska.
"Neither Lake Iliamna nor its smaller neighbor, also known as Lake Ilaklehma, has ever been fully mapped by local researchers."