There have been three known Sith Lords to bear the name Darth Wyyrlok, all Chagrian voices/regents of the One Sith and second only to the Dark Lord of the Sith. As all the holders of the name are direct descendants of one another, the title is seemingly hereditary.
As of 137 ABY, one other Chagrian, Saarai was expected to take the title:
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