My stepmum, it can be confusing as our surname is quite unusual. I don’t mind being referred to as young zen but she’s not so keen on old zen! My dad used to call us zens.
My best friend’s mum also has the same name and I have a good friend with the same name too, we met through our children’s hobby where there was another mum also with the same name, so the mums were zen, zen, zen and Sarah.