Combine this with Anglocentric IT systems, and I'm sure Mr Lee (RIP) gets a lot of spam addressed to "Mr Yew".
Surprisingly, local systems outside of the SG government can still take a maddeningly Western approach to names (First name/last name, assumption that last name is a family name a not a patronymic, etc.). My wife is Singaporean Tamil, so her "last name" is actually her father's given name, and even when travelling around Southeast Asia she encounters issues with this.
Fortunately, the SG government does an admirable job of handling Chinese names (across a number of languages and cultures), Malay names, Indian names of various cultures (mostly Tamil, but also Punjabi, Malayalam, and several others) and of course many Western names. I wish the Western world would catch up.