When i was born i was named John. People thus named were often referred to as Jack, Jackie, Johnnie etc. When did the name Jack become, more or less, a seperate name.
One of our lads is Padraic, apart from even close relations calling him Padraig I still like it. It may get shortened to Paudie but I dont mind that either.
Ah come on now, that's always going to happen! If you're going to pick a name that sounds almost the same as another name that is way more common you need to accept that a substantial proportion of people are just going to get stuck on the name their brain thinks it "should" be.
I know a lady called Finola who gets really snotty when people address her as Fionnuala - big deal like! I've got 2 older brothers and I will regularly answer to being addressed by either of their names and normally wouldn't even bother correcting the person, unless I think they actually believe I'm him... (although I do draw the line at being called by my sister's name!!)