People... unless you're being mocked like the OP, nothing wrong if you don't get you're names pronounced perfectly well. Especially vowels. We don't have mixed vowel sounds. Someone mentioned Facundo... I met a Facundo in college, in the US. He was an Argentine, too. Faekiundou was just about as close as the average American could get. My name's Hernán. I got Hérnan with a sounding H. Most people could get those rigth after some time, but the Spanish R... nobody that I knew. And after four years in the US my English still sounded like cr*p, anyway.
I'm very surprised about Glen and Glem, though. The N's just that... an N!