I have always been called by my 2nd name... I prefer it that way. I don't think my 1st sounds as good.
However when it comes to legal documents & filling out forms that require my full name & signature.....
whenever I have to speak to someone in that regards I have always had to tell them that my preferred name & the one I go by is my 2nd name.....
and they keep calling me by my first.
Work, govt forms, Council forms, Insurance, super, etc etc.

50 years of correcting them.
My brother has always been called by his 2nd name ... because his first is the same as our fathers first name.
Our names were choosen that when our full name was spoken it seemed to flow together.