The goal of the HARRISON Surname Project is to distinguish between HARRISON ancestral lines, worldwide. Any reasonable spelling variant is included (please feel free to suggest a variant you feel I have missed). Please note that, at the outset, it makes sense to "cast the net widely."  Also please note that, to participate meaningfully, you will need to share your male direct-line ancestry either in the form of a pedigree or, preferably, as family group sheets.