The Oxford Names Companion, OUP "Scottish Forenames" - Donald Whyte, FGH, FSG
Notes:
Scottish and occasionally English. Akin to Alec/Alex, Alick was originally a shortened form of, or pet name for, Alexander. It can also be used as a given name in its own right, particularly in Scotland.
Thanks to Donald Whyte who provided much of the initial information for this site.