Of Scottish origin but now widely used in the English-speaking world. It is derived from a topographic term denoting a narrow strait or channel and in part is a transferred use of the surname, a local name from the region in Ayrshire so called. As a girl's name it appears to have been largely superseded by Kyla.
English and Scottish: patronymic from the personal name John. As an American family name, Johnson has absorbed patronymics and many other derivatives of this name in continental European languages. (For forms, see Hanks and Hodges 1988.)