For those who aren't aware, the name Jepsen is a play on Carly Rae Jepsen, singer behind "call me maybe". In my opinion a perfect name for a distributed systems research effort.
First commit is from 2013. https://github.com/jepsen-io/jepsen/tree/4b112e7046a20efa80a...
And the song is from 2011. Time flies.