Any participants with any surnames in the form S*nn*t are welcomed (eg Sennett, Sinnett, Synnott, Sinnatt, Sennitt, etc), but particularly keen to get participants who can trace their ancestry back to Co Wicklow Ireland, or Co Wexford or Cornwall, to see if your line will match existing participants.
This is a y-DNA project so you need to be male and be able to show an unbroken male line to your earliest Sennett, sinnett, Sinnott etc ancestor. If you need help with your family tree, contact the Sennett, Sinnott surname study through the Guild of one Name studies. The DNA project is at familytreedna with the primary project name being Sennett, but it does include any of the above variants, with project t members including Sinnott and Sennett so far.
