I thought of a theory, maybe Mike and Eleven have 4 children when they are adults and get married:

First they would have a daughter who would call her Teresa "Terry", like Once's mother.

Later would follow a boy named Robert "Bob", like Bob the superhero Will described when he had already died at the hands of the demodogs.

Then another male and his name would be Benjamin "Benny", as the cook who fed and dressed Eleven.

And finally, a girl who could be called Sara, like Hopper's deceased daughter.

It just occurred to me. I was just waiting to see what they think.

Discuss which of these names you like best.