So, Zur, and Nub

So, Zur and Nub (Tib. སོ་ཟུར་གནུབས་གསུམ་, so zur nub sum, Wyl. so zur gnubs gsum) are the family or clan names of three great masters of the Nyingma school who were the early holders of the Nyingma lineage of Kama. Their names are:

• So Yeshe Wangchuk,
• Zur Shakya Jungne, and
• Nubchen Sangye Yeshe.