Source SNP Tracker, SNP data by FTDNA
https://scaledinnovation.com/gg/snpTracker.html?snp=R-BY61223
See newer migration maps, GlobeTrekker by FTDNA for specific BigY YDNA Line.

Ballard Group 1 BigY YDNA SNP Line:
M269>L23>L51>P310>L151>P312>Z290>L21>S552>DF13>FGC11134>FGC12055>Z3026>Z16250>A114>CTS4466>S1115>Z3023>FGC84010>A541>S1121>Z16252>Z18170>FGC29280>BY3536>FTB32484>BY61223

The BigY is a series of connected SNP's from Ancient times to the birth year of the tested project member. The BigY Twist Tree can tell you if any other surnames have been used along the way. During Medieval times even the male surnames were often changed to take advantage of a more powerful and wealthy family. The name can change but not the YDNA! Enter your BigY SNP here and then on the top right of the SNP tree branches, click one at a time from right to left to display the surname history for that SNP. This photo is the Twist Tree for Ballard BigY Group 1 (R-BY3536), Virginia. Notice the different surnames (underlined in red) along the timeline of that group. Thank you BigY!!

Surname: Desmond https://en.wikipedia.org/wiki/Earl_of_Desmond