Hi Gio. Welcome to the forum.
I have hear this before, but i believe it is still a point of contention. There are many who will tell you that the number must always be odd because odd numbers are masculine in the culture and as the ultimate masculine symbol the keris should never have an even number of luks. But i have hear that the number 12 does have a special significance. Whether that means it would be used for a keris remains a question.
