Two that have stuck with different groups of people.
* Muscles - first job from school was working on the factory floor making brake cylinders & car water pumps at Brompton. I could move the stillages of blank castings to near the machines, so the older guys stired me up.
* Macca - I get sick of being called michael, carmichael, etc, etc because of my family name Macmichael. Also, many others in a group are Andrew. So Macca is quicker & easier to remember for people.