I actually had an uncle named Shirley!............He went by ‘Wayne’................
A shame for him. I worked with a guy named Shirley in the record department of a Korvette's department store in the year my minimum wage as a college kid was a full $1.25 an hour (1966). He never used a nickname, just always said "Yes, that's my real name."
Funny true story: Bob Dylan's first wife was Sara Lowndes. Her first husband had told her I refuse to marry any woman named Shirley. Change it." She did and married her.