Why are Anthony's called Tony?

Could you please elaborate on the origin of the nickname "Tony" for individuals named Anthony? Is it a cultural phenomenon, a linguistic trend, or perhaps a personal preference that has evolved over time? Is there a specific reason why Anthony's are often referred to as Tony, or is it simply a matter of convenience or familiarity? Additionally, are there any other names that undergo similar transformations, and if so, what are they and why do they occur?