The Brogan Surname is open to anyone who is researching their paternal Brogan line. Having a male test for Y DNA is suggested. Tracing the paternal line requires a male to have a Y-DNA test as the y-dna is only passed down thru the male line from father to son and so on. A test at 37 markers is helpful in identifying a probable match. For more accuracy a 67 marker test can be taken or even better yet the 111 marker test. The lower marker tests can be upgraded to the next level of testing .