"Di" but I still get called that to this day. It doesn't bother me but it bothered my brother. He'd always tell my Mom to quit calling me that because it sounded like she was telling me to die lol Of course, she never did. Some call me "Di Di" which I'm not crazy about but I can deal.
Molly Polly Olly
Melly Belly Welly
Never was too fond of any of those monikers. I have my little brother to thank for them.