Masonite is the name I normally hear. Believe that is actually a specific manufacturer and not a generic name, but most people I know call the generic product Masonite in the same way that we still talk about "Xerox-ing" things on a Canon copier

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8