I have a Welsh name. It isn't long - just two syllables. I am Welsh, but live in the SE now. Coincidentally my MIL is also Welsh. My ILs and SILs live nearby. All of 'my side' of my family still live in Wales.
DH and I have been together for 11 years, married for 6. Until we got engaged, ILs always said my name wrong, and to start off with, I corrected them (quite shyly, I suppose - for some reason, I was embarrassed that they were getting it wrong), but then I stopped. When we got engaged, DH and I decided that our parents should meet. They hadn't met before because each set of parents lives 250 miles from the other. In advance of that, I said to DH (DP as he was then) something along the lines of "please would you tell your parents how to say my name properly, because my parents are going to think it is very strange when they meet that your parents are mispronouncing my name". DH happened to see his parents that night, said about it and that was that.
Right. DH has always called me by a shortened version of my full name. So, he just says the first syllable. Since he had that conversation with them, they (and SILs) have all called me by this shortened name. I don't like the shortened name. I would never call myself it, and all of my side of the family and my friends call me by my full name.
At our wedding, when we said our vows, DH and I of course said my full name. Cue lots of DH's side of the family (but not SILs and ILs) apologising to me afterwards for saying my name wrongly, but they were only "saying it the way ILs said it". Fair enough!
AIBU to be annoyed that my ILs and SILs (and now SILs' partners) will not use my proper name? I feel that its laziness that they won't try and say it properly, and even though I don't like DH using the shortened version, I sort of see it as a pet name he has for me now. I don't know why they can't take their cue from my parents and from me, saying my name 'properly' as they have met my parents loads and loads since (especially now that we have DC and spend time together as an extended family). I am waaaaaaay to embarrassed to bring it up with them though 