Welcome to the O'Shea yDNA Surname Project. Any male with the name O'Shea, Shea, Shay, O'Shee, McShea or any variant, is encouraged to participate in this exciting yDNA surname project. Actual testing in the O'Shea yDNA Surname Project is for males only as males have yDNA which follows the paternal line. Females are very welcome to add a male O'Shea relative to represent their O'Shea family line. We look forward to hearing from you.