Sikhism is the main religion in Punjab, India. One of the main tenets of the religion is that males are not to cut their hair so that they can easily be recognised as practioners of the faith and is a declaration of their faith.
As a result, Sikh males will have full beards and moustaches and long hair. The long hair is tied into a top knot and then covered with a turban.
Male followers of Sikhism are required to add "Singh" (meaning lion) to their names.
There is absolutely no link between the Sikh and Muslim religions.
One more interesting thing is that the Punjabis are traditionally a race of warriors and wear knives. Today, this is often symbolic and the males wear little pendants in the shape of their traditional knives.
I believe this explains why Jot also designs and makes little knife pendants, its part of his tradition.
My apologies to Jot and all Sikhs if I am not entirely accurate on the above. I am not a Sikh but there are quite a number in Malaysia too and I have friends who are Sikhs.