Baba | بابا
This is the name we usually refer to our Sheikh and those Shaiyukh that came before him. (for us)
This is taken from the Sunnat of Hazrat Bibi Fatimah az-Zahra (rz) as she would refer to her Holiest of Holy Farther, Hazrat Muhammad Mustafa (saw) as “Baba”. This Sunnat continued with her children. (context)
There are only 2 relation names in Arabic, “Baba” (Father) and “Mama” (Mother), where a person’s lips have to come together, twice in a repetition. There are no words that we know of where this happens in any human language. It signifies Unity of Being, as the lips unite, but twice, as with 2 Sajjdah in a single rakat of Salaat. (deeper Sufi context)