[dalke]

According to http://en.wikipedia.org/wiki/List_of_programming_languages we're missing A, H, I, M, N, O, P, and U-Z, so half the alphabet.

However, this list is incomplete.

H - http://dcoj.wmh3.com/cscos/h/

M is sometimes used to refer to MUMPS (see http://en.wikipedia.org/wiki/MUMPS and http://www.mumps.org/ ). It was also a language at Microsoft, http://www.theregister.co.uk/2008/10/10/dial_m_for_microsoft .

N - http://link.springer.com/chapter/10.1007%2F978-3-642-76153-9...

Z - https://github.com/chrisdone/z

In other words, the answer to your question is either "yes" or "that's already happened."

[beagle3]

J actually descended from A, Arthur Whitney (of K and Q fame). The famous origin of J[0] was called A at the time it was created, and Whitney developed it into an APL; A version with GUI was called A+ and was later GPLed[1]

[0] http://www.jsoftware.com/jwiki/Essays/Incunabulum

[1] http://aplusdev.org