Just a thought : _
Christine gets shortened to Chris
Michael gets shortened to Mike
Fairly obvious but when I tell my children that "Aunt Peggy's real name is Margaret" - they look at me as though I must have gone mad.
Would a thread that gave possible variations help - with maybe a linked process to show the logic if we know it!
eg. Margaret --Meg - Peg
These might vary too in different parts of the country: