@marbellamarc, because every single time I meet someone new they get my name wrong.
You can say it doesn't matter, but it matters to me. If I am lucky, they'll say Mrs Surname - always Mrs even when I was a child.
When they get it wrong, it won't be an Amelia/Emilia type mistake, it will be something hideous.
It's not Griselda, but if it was, the wrong versions would be Gridelsa, Gresmerelda, Grimella, Glinda and Gertrude.
It's every doctor's appointment, every dental appointment, every hospital appointment, every optician's appointment, every time I have to go to the police station, job interviews etc. My name gets entered wrongly on things like Change of Address requests and prescriptions.
Oh, and there are people who just insult the name to my face.
If it doesn't happen to you, you won't know what it's like to have your lovely name be said in a way that is ugly to you.
I don't think Reiltin will be as problematic, but from this thread we have had Rae-elle-teen/Rail-teen/Rail-CHEEN pronunciations. Add a few Ryle-tins as well and all the possible typos, and that the accents will usually be omitted, and Réiltín may not find it so easy to live with.