Ng was the son of Ng Ngoh Tee, who was of Teochew Chinese origin and represented Johor in Badminton championships during the 1920s and 1930s and his wife Mak Cheng Hai, who was a distant relative of another state badminton champion Wong Peng Soon.

[1] Billy made his first foray into badminton in August 1959 when he was crowned Malaysian Schoolboy Singles Champion.

Billy represented Malaysia & finished runner-up in the inaugural Asian Badminton Championship (ABC) in 1960.

The Malayan 1967 Thomas Cup team played in an extremely hostile home crowd at the Istora Senayan Stadium, Jakarta.

Three years later in July 2010, Billy Ng was conferred Darjah Indera Mahkota Pahang (DIMP) which carries the title Dato'.