Asperger's Syndrome is named after Hans Asperger, a very clever fellow who, in 1944, recorded a set of notes about the behaviours of some boys he had as patients at the time. These boys presented as meeting some, but not all of the criteria for a diagnosis of Autism.
Hans Asperger's name is pronounced with a hard G (as in gory, gross and green, NOT as in aubergine). So is Asperger's Syndrome, as it is named after the man himself.
If you have trouble remembering this in the moment, think to yourself,
"Ass Burgers" - then smile, and pronounce it properly. I can tell you on behalf of my child with Asperger's, who identifies with the title with great pride, it drives him crazy that so many people say it incorrectly.
It's a very small thing, but it matters more than you probably imagine, so thanks for taking the time to make an effort with it. :D