I've been quite annoyed with the naming system Malaysian Malay use..
In our culture, normally, people doesnt use "FirstName LastName" system, but "GivenName FatherName" instead. Ok, for local use, its not much a problem as people here understand the system. But when it come to dealing with international softwares/people, it got tricky, and sometimes, frustating.
For quite a number of people, "GivenName FatherName" system doesn't hurt them much because their parent only give them 1 word name, and the father only have 1 word name. So they just assume GivenName as FirstName and FatherName as LastName. But, the system also allows the use of very long names that make it hard to differentiate which is which, and I am one of those with such names.
"Mohd Izhar Firdaus Ismail" - heh, try finding which name to call me from that name (I'm assuming you are not Malaysian) - I'm pretty sure most will just call me "Mohd".
I personally adopt "Izhar Firdaus" when dealing with international stuff. However, sometimes, on certain automated system, I got really annoyed and confused. (eg: gramps)