I recently heard from a researcher about joining her husband's yDNA results to our Hawkins yDNA project. Her husband does not carry the Hawkins surname as his Hawkins connections are on a female side of the family. I explained to her that she would not get anything of interest from joining since he would not match anyone in the project with yDNA.
The researcher is fairly confident about her husband's Hawkins connections to Robert Hawkins who immigrated from England. Robert Hawkins married Anne Prebble soon after his arrival on our shores. She suggested a good source of information for this Hawkins family line:
Baltimore County Families, 1659-1759
This book is available on Ancestry.