There are at least two artists with this name:

1)
’60s-sounding Welsh blues singer Aimee Anne Duffy – known professionally as Duffy – released her debut single Rockferry in December 2007. After relocating to London in 2006, she came to the attention of Rough Trade. She is often compared to late ’60s soul diva Dusty Springfield and has experienced significant mainstream success with the single Mercy reaching #1 in the United Kingdom. The debut album, Rockferry, was released in March 2008, and also made #1 on the UK album chart.