Off topic: where did you get the name from? There's a town Clavier (Claviere in French) in the Italian/French alps.

Clavier is keyboard in French and German (Klavier)

36 because, just like base64 uses 64 characters, clavier uses A-Z and 0-9 :-)

An loanword in English, many will recognize it from Bach if nothing else https://en.wikipedia.org/wiki/The_Well-Tempered_Clavier