Lone Wolf and Cub is known as the Baby Cart Series
Movies in order.
1. Sword Of Vengeance
2. Baby Cart at River Styx
3. Baby Cart to Hades
4. Baby Cart in Peril
5. Baby Cart in the Land of Demons
6. White Heaven in Hell

EDIT: nearly forgot, there were two compilation films made for the US audience.

1. Shogun Assassin
2. Lightning Swords of Death