Usually if it's one's dad's it's in his name or the family name.
Cara doesn't strike me as a name a dad would have and it doesn't particularly strike me as a family name. I mean it is possible but... Besides there only seems to be two polar bears in town based on what what's been said.
It definitely has changed ownership from when it was Zelmo's (may he be bring more joy a sausage biscuits than he did as a slinger of beans).