The HiLux name was dropped in the United States during the 1970s, although it's still used overseas. For most of its life, Toyota's small half-ton pick-up was simply known as "the Toyota truck" here in the states.
A four-wheel-drive version in 1979 quickly became famous for its rugged durability and relatively nice interior.
As Toyota introduced new, larger trucks in the 1990s, it became necessary to give the Toyota truck its own name again. In the United States, it's now called the Tacoma.