It is currently a male name used in English. It was a nickname that was used in English to those who bear the name of John or also to those named Jacobs or James. In electronics and communications it is a type of female audio jack, which is used to connect microphones or headphones. It is also an English surname of Scottish origin. Surname of a great botanist, entomologist and dendrologist, whose full name was John George Jack born in Canada and nationalized American.
