Mohamed
I'm going to save your post as a concise explanation of the name difficulties in your area. Have you taken a look at the naming conventions projects? Perhaps one can be established for Southeast Asia, with active managers in the area contributing their thoughts.
Geni name fields were set up based on a contemporary American contact manager GUI which is of course severely limited for other languages, styles - and our own English origins ! There are however several things that have proven useful, and that is the "display name" field & the " also known as" (free form text string, comma separated).
I've been able to "stuff in" multiply named historic figures with accuracy by working with this.
We have the same problem in USA of course -- only 5 names in use, spelled many different ways ...