It’s the pronunciation!

I’ve met quite a few Nguyens over the years so I got the reference and giggled.

From google:

Southern Vietnamese tend to clip some of their sounds, so Nguyen would be pronounced something like “Win” or “Wen.” Northern Vietnamese would keep it, giving a pronunciation more like “N'Win” or “Nuh'Win,” all done as best you can in one syllable

Now you can giggle too 🙂