Although it's gone far beyond just Julia and Python now.
Edit: Ahurmazda is right.
...the core programming languages supported by Jupyter are Julia, Python and R. While the name Jupyter is not a direct acronym for these languages, it nods its head in those directions. In particular, the "y" in the middle of Jupyter was chosen to honor our Python heritage.
Although it's gone far beyond just Julia and Python now.
Edit: Ahurmazda is right.
...the core programming languages supported by Jupyter are Julia, Python and R. While the name Jupyter is not a direct acronym for these languages, it nods its head in those directions. In particular, the "y" in the middle of Jupyter was chosen to honor our Python heritage.
https://github.com/jupyter/design/wiki/Jupyter-Logo