My first granddaughter was given my name as her middle name, so I wanted her to associate that with me. I became GrammyLynn. It stuck with some of the other grandkids, but otherwise I'm Grammy and my husband chose Papa. My brother's daughter lives in AZ, while he and his wife live here in Vermont. The grandbaby calls her Gram'Mont which I think is kind of cute. For you I agree GrammaCathy would be nice. But whatever you are called, it will be the best thing in life to have a little grand.