He spent a couple of years in Singapore, so I'm going by the pronunciation there. (May be different in different regions, and I'm not sure about his preferred pronunciation now). It would do something like this:

Start with the word "urn". Now don't drag it out, make it short. Make the "n" and "ng" sound at the end (urng). Now take out the "r" sound (uhng).

It seems like Americans do tend to pronounce it "ehng" instead.

Your comment appears to be correct: https://www.quora.com/How-does-Andrew-Ng-prefer-his-name-to-...

In the video it sounds like "ooge". Similar to "rouge" or "stooge" but cropped short.

https://www.youtube.com/watch?v=sUO3Pk0nOCM

Sounds like "ng" to me. In english, we can say "mmm" or "nnnn" as drawn-out sounds on their own, just do the same with "ng".

So it should rhyme with Hung and Sung?

As a Singaporean, this is the correct answer.

Tip: when you don't know how to pronounce someone's name, find an interview (podcast? video interview?) with that person.

"ing"

sounds more like oong or ooung to me (1 syllable).