I'm not meaning to come across as snide; am just curious: a (presumably) Malaysian, or Indonesian, called Sean, and a Korean called Kevin? Or are those "aliases", used instead of their difficult-for-Anglophones real names?
Like PPs, I've encountered a number of Asians who chose "Western" names to go by rather than going by their given names. Many (if not most) of the Asian-Americans I know also have very "Western" names, which I presume are their actual birth names. In fact, at the moment, there are four different guys named Kevin who I interact with regularly, and every single one of them is Asian-American!* So that particular name choice didn't strike me as at all unlikely. Rather the opposite!
*Three of "the Kevins" are involved in the same student club, which gets really
confusing, since we rarely use surnames at club activities. I can't count how many conversations I've had that boil down to:
Person A: "[Something something] Kevin..."
Person B: "Which Kevin? There are three of them."
Person A: "Oh, there are? He's an Asian guy."
Person B: "Uh...they're all Asian, actually. Is he a new guy? Is he short or tall?..."
Never met someone without a second/family/surname, except for celebrities like Cher and Madonna who have last names but just don't use them anymore. (Okay, I haven't actually met them, but you know what I mean.)
I recall a friend from India once explaining that her "surname" that she used in the USA was actually her father's given name rather than a family name. The impression I got was that she had not had/used a surname in India, but had started using her father's name when she was moving to the USA, where everyone is expected to have a surname. If there's anyone here familiar with India, does that sound normal/likely? I might be misremembering, but I think
that's what she described.