I feel with you. Lived in England for more than 4 years with my Germanised Polish surname. People like me just come the Britain to make live difficult 
. I guess most people do not worry much about butchered names as long as the person you talked to made an effort.
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I have a simple last name, “Mattan”. My picture was in my high school year book six times my senior year (sports and clubs and such). With six different spellings. My class had 104 students graduate. No excuse to get it wrong.
As part of my job I interviewed prospective new hires. One of my first questions was “how do you pronounce your name?” I had team members on four continents and strived to get names correct.
I suck at remembering names but understand how demoralizing it is when you get it wrong, sending a clear signal that the person doesn’t matter to you.
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Me too, always have been. And that has not improved with age. But if someone mentions a name to me, or I read it somewhere, the “data” frequently gets refreshed in my memory. So I started keeping company phone lists when I left for a new job, and directories of organizations to which I belonged, etc. That info got scanned in years ago and stored in an online folder, in case I needed to look someone up.
And my Contacts contains what I remember about past friends and co-workers. Many of these cards don’t even have an email address or phone number listed. But I occasionally update them with names of children & spouses, anniversaries, etc. when it becomes available.
I’ve been doing this for years. Some day I hope my work will help Siri remind me of Zack’s name, when I run into him at the grocery store. 
I have a first name that is somewhat common but my spelling is unusual. I’ve only ever met one other person with the same spelling. I’m very used to it being misspelled (most recently, yesterday!) and the first person to get it wrong was the official who filled out my birth certificate! Hence the unusual spelling.
My last name is only five letters yet a distant cousin uncovered 60 different spellings just on official documents. The 60th was invented before his eyes by a clerk in the office of births deaths and marriages.