Later, someone nicknamed the founder Bak Kut “Teh” (“Teh” is his last name which means “place” in Chinese which is the homonym of another “teh” meaning “tea” in Yong Chun dialect). Since then, the soup is mistakenly called Bak Kut Teh meaning “Bak Kut Tea”.

http://keehiong.com.my/en/branding_story.html
BKT came from Klang. Of course it's not the same as whatever it is in China.

The story can be traced back to the time after the Second World War during which Malaya was still under the British colonial rule. Mr. Lee was then selling his stewed “Bak Kut” (Bone & Meat) originated from his hometown in China. On one occasion, he tried to improve his bak kut soup by adding in some Chinese medicinal herbs. As a result he created the first ever created delicacy whose flavor was much to the liking of gourmets until it became a household name.

http://keehiong.com.my/en/branding_story.html