My name is Kathleen but I am called Kathy, Kathleen or Kate/Katy depending where in the country, or world, I am.
Kathleen was only ever family and my mother detested it to be shortened going so far as to tell others not to do it.
Kathy came about when I moved to London aged 18 and everyone started calling me Kath, which I hated but I don't mind Kathy.
Now where I live I'm Kate, except for my lovely postman who decades later, although he knows I am Kate, calls me Kath!
My mother was Aggie until she was about 60 and started requesting to be called Agnes. Amazingly, all her friends of 50 odd years did. Her middle name was Caroline and when I asked why she didn't choose to be called that when she was younger as it was a prettier name said she didn't like it.
Desperately sad story of the assisted suicide of a grieving mother



