<Li> 1978: Cool Ruler (Front Line) </Li> <Li> 1979: Soon Forward (Front Line) </Li> <Li> 1978: Slum (Gregory Isaacs in Dub) (Burning Sounds) </Li> <Li> 1979: Gregory Isaacs Meets Ronnie Davis (Plant), with Ronnie Davis </Li>

Where does the last name isaacs come from