[Karto]

I had a similar experience in spite of not needing any R, living and working in several English speaking countries. My name is Mathias, and the variety of ways English speakers called me was a proper issue, in the sense that I sometimes didn't even recognize that somebody was talking about me, or calling me across a workshop. When I started introducing myself as "Matt", all became easy. Never had this issue with pretty much any other culture I worked with :D (all kinds of Europeans and Arabs mainly)

If it's about Rs, I worked on an oil rig with a Mexican guy named Javier. The American OIM had such hard time telling "Javier" (with the two different gutturals) on the tannoy, Javier got called "George" for the rest of our stay.

[umanwizard]

Which two gutturals? “Javier” only has one sound I’d call “guttural” — the velar fricative (i.e. the Spanish J sound).

[Karto]

My wrong, I meant the two different non-english-like consonants.