Duffy not named after this singer/songwriter

http://www.dailymail.co.uk/tvshowbiz/article-515536/A-star-born-Welsh-songbird-Duffy-tops-charts.html

The suburb of Duffy was named after Sir Charles Gavan Duffy

He was knighted in 1873, and was a Member of Victorian Legislative Assembly

Duffy street names theme is Dams and Reservoirs.

Source:- Canberra Suburbs and Street Names. Origind and meanings.