Forth is so named because in 1968 "the file holding the interpreter was labeled FOURTH, for 4th (next) generation software—but the IBM 1130 operating system restricted file names to 5 characters."
1968年の"he file holding the interpreter was labeled FOURTH, for 4th (next) generation software — but the IBM 1130 operating system restricted file names to 5 characters."において Forth は命名された。