[Oyk]

He had 3 brothers and 2 already passed away.

His brothers' children would all have the surname of Sim.  His sisters' children would have the surnames of their husbands.

So, we should expect to see these surnames among his nephews and nieces:-

1.  Sim
2.  Ong
3.  Chee
4.  Chew
5.  Low

Now let's go down one generation.  How did these surnames come about?  Whose children are they?

1.  Tay
2.  Lim
3.  Li
4.  Xu

A lot had been written about the Malay names but no one asked about those Chinese surnames.  Do not tell me that SWH's family background is full of adoptions.