Hi Clare, If you are going by family names, Meng is under M and I believe Seo under S. The Chinese write their family names first, and I believe the many other Asian countries too (until that was changed by the Americans after World War Two).
> Meng Weining - under M or W
> Wonseon Seo - W or S
Regards
Tiong Boon
P.S. My family name is Pek, so that is under P.
