The Y-DNA results for William Gowan/Gowin/Going are derived from descendants of his sons Joseph, William Jr., Daniel, and James (FTDNA order):
Haplogroup I2a2a1a1a1 (formerly I2b1a1) / M223+ / M284+ / L126+ / L137+ / L369+ / I-Y4751+
15, 24, 15, 10, 15, 15/16, 11, 13, 11, 12, 29, 16, 8, 9, 11, 11, 26, 15, 20, 29, 11, 11, 14, 15, 11, 10, 19, 21, 14, 14, 19, 18, 31, 37, 12, 10
Additional markers are available up to a 110-marker test.
To date, twelve family members have tested with a confirmed match. Descendants of sons, William Jr., Joseph, Daniel, and James have been tested and confirmed 100% match.
This specific Haplotype and subclade are believed to be indigenous to Scotland, having been there for over 5,000 years!
Complete results at Family Tree DNA MacGowan Project Website: http://www.worldfamilies.net/surnames/mcgowan/results