Surname and given name on train bookings

Hi. I sought advice and was told to input my name based on the requirement - surname, follow by given name.

I am very worried that I would be denied boarding if the format is wrong.

My name is displayed as Shirley Lim Si Ling in my passport

Which order is correct?
1) Surname: Lim
Given name: Shirley Si Ling

2) Surname: Shirley Lim
Given name: Si Ling

Many thanks.