The tea estate derives its name from a Sikkimese local 'Phurpu Tshering'.

Some articles have also referred to Phurbu as a Lepcha, this may be due to his common share of genealogy with Chebu Lama.

"Subsequently, on his death, this tract was leased jointly to Rechuk Dewan the son of CL, Pharbu Diwan, his brother and Raja Tenduk Pulger, his nephew and adopted son."

A more recent detailed study on the topic "Flighty Subjects: Sovereignty, Shifting Cultivators, and the State in Darjeeling, 1830-1856" by Catherine Warner offer us insights into the genealogy of CL.

"Since descent was often determined by the father’s side of the family (thus the Namgyals could marry Limbu and Lepcha wives, for example, without producing Limbu or Lepcha children), and Chebu Lama’s father was not, as mentioned, a Lepcha, he probably retained the option of identifying with Tibeto-Sikkimese circles" R.K.Sprigg in his article titled '1826: The end of an era in the Social and political history of Sikkim' states that his "wife's grandfather, David Macdonald, claimed that the Cheeboo Lama's brother Phup (or Phurbu) Tshering (after whom one of Darjeeling's oldest tea-gardens is named) was his maternal grandfather".