Naming your source control tool after a common mistyping of ls is such a Facebook move.
Yeah! What are they going to do next - call a programming language "go" or something ? Even Google would not be that stupid - imaging Googling for that and getting only irrelevant stuff!
Naming it after a commonly installed program that has been around since 1993 is also some hubris.
The reality is that most devs writing code in Facebook were not alive in 93, and certainly weren't Linux admins at that time.
Does Facebook even have any greybeards in the trenches?