My given name is Chris. Way back in February 1981 I started a new job, and there were already 4 people called Chris in the team of 12.
Nick-names were already used to identify the other 4 individual Chris' so I was immediately re-named 'Chezz' (derived from my family name) - the name has been with me ever since. I added the 55 'I thought it sounded good.