Maybe it's just where I live but people generally just go by what they introduce themselves as unless it's like
Elizabeth and people will automatically call you
Liz sometimes. But I knew a girl named
August growing up and everyone just knew her as
August, that was it. Likewise, I knew a
Jacob and a
Kathryn in high school who went pretty much strictly by
Jacob and
Kathryn. It was actually really weird when someone out of the blue would call them
Jake or Kate/Katie, it was like "huh?" and made everyone really uncomfortable for some reason. Often times, it would be other kids correcting the teacher saying "no it's only
Jacob!" because it just seemed so off.