The game is known by many names, including Nine Mens Morris,
Morelles, Merrills, Merels, Mill or just plain Morris.

There appears to be two forms of this ancient game called Three Mens
Morris. One version has diagonals and the other does not. The
diagonals form is essentially the same game as tic-tac-toe. A board
of this type has been found that was carved into the temple at Kurna,
Egypt around 1440 BC, although it may have been done at a later time.

The Chinese also played the game around 500BC, according to a man
named Thomas Hyde.

The Romans are known to have played the game.

The game was played in England as far back as the 1300s and
Shakespeare mentioned it in "A Midsummer Night's Dream" Act 2,
Scene 2 - "The Nine Mens Morris is filled up with mud".

Apparently there is an existing Morris Club that you can search out
on Yahoo. (I can only guess how old some of the members might be!)