This site has an extensive online quiz on computer languages.
I managed just 11/75 (actually it was 12/75 but I pressed the wrong key when typing ‘Java’): a miserable 14.67%.
I missed some of the languages I use regularly yet got some I have never used, or maybe not used for close to 30 years (though I did, relatively recently, translate the Reingold-Tilford algorithm for drawing Red-Black trees from the original Pascal into C++, so maybe that helped.)
Love to know how you score.
cartesian product ... stuff about computing mostly 
One response to “How many languages can you recognise?”
Not much better: 15/75. I booted a few (Mathematica, Pascal, Assembly, FORTH come to mind) where I’ve had at least some exposure to the language, but not in this millenium. Other than Mathematica (kicking myself there), I don’t recall enough of those languages to recognize them.