(from Wikipedia)
The Hakka (Mandarin: Kèjīa) are a subgroup of the Han Chinese
people who live predominantly in the provinces of Guangdong,
Jiangxi, and Fujian in China. Their ancestors were often said to be
from Northern China or Central China centuries ago. It is still a
contested issue where the Hakka originated. It is said that in a
series of migrations, the Hakkas moved, settled in their present
locations in southern China, and then migrated overseas to various
nations throughout the world.