Eden Prairie High School principal Conn McCartan has announced his retirement at the end of this school year. Comments (-1) School Board membership changes begin the new year
a person who has responsibility for the care of another he could no longer keep up his role as caregiver for his sick wife Synonyms carer, caretaker, guardian Related Words foster parent; babysitter, minder, nanny (also nannie), nurse, sitter; custodian, guard, keep, keeper, protector; attendant, chaperone (or chaperon), companion Near Antonyms ...
People often use 'short for' when they mean 'informal' even if the nickname is longer eg Eve/Evie. OP if you're thinking of using Polly I think people will just assume that's her official name. It's been many a decade since people called Mary but known as Polly were born. Most people wouldn't even know Polly was derived from Mary.