Why it was named after him/her?:
The town was built in 1870 and named after Colonel James M. Donahue, the enterprising builder and principal owner of the railroad. Located on Petaluma Creek, it was eight miles from Petaluma and seven miles from Sonoma. The town and it's buildings were moved to Tiburon in 1890. The farm of J. R. Rose, a pioneer breeder of thorough-bred Devonshire cattle was situated a few miles below Donahue.
http://users.ap.net/~chenae/socotown.html