Currently NumPy has a function, hanning, that is documented as "return[ing] the Hanning window". See here:

https://numpy.org/doc/stable/reference/generated/numpy.hanning.html?highlight=hanning#numpy.hanning

This function is actually a misnomer for the Hann window. The window is named after Julius von Hann. Its Wikipedia article even mentions this confusion over its name:

"However, the erroneous 'Hanning' function is also heard of on occasion, derived from the paper in which it was named, where the term 'hanning a signal' was used to mean applying the Hann window to it. The confusion arose from the similar Hamming function, named after Richard Hamming."

The NumPy documentation also mentions the discrepancy:

"The Hanning was named for Julius von Hann, an Austrian meteorologist. It is also known as the Cosine Bell. Some authors prefer that it be called a Hann window, to help avoid confusion with the very similar Hamming window."

I don't know what the basis for this latter claim is. matlab, SciPy, TensorFlow and PyTorch use the name hann or hann_window.

I suggest adding an alias to satisfy existing NumPy users and those would prefer the correct name.