Yabby U (dub/reggae artist & producer Vivian Jackson, aka 'Yabby You')
Many of the early recordings had fairly vague credits. There are instances of Yabby U, Yabby You and Vivian Jackson being the artist for tracks on the same album (although he mostly used Vivian Jackson when in collaboration with backing groups such as The Prophets), or for the same tracks but changing depending which compilation it's on.
Yabby U is the most reliable name, and the one used most consistently.
Legal name: Vivian Jackson (Jamaican reggae/dub artist, aka 'Yabby U'/'Yabby You')