How would I research the genealogy of last name HO (浣? from China to Hong Kong in the 1940's?

-All I know about my grandfather is that his last name is Ho (浣? and in the 1940's he was a Chinese citizen. Around the time of WW2 his family left China and migrated to Hong Kong while he stayed behind. No one in my family has heard of him since.



How do I track down this man? Where do I start to research? Can I find more records about this