Keach
Yes, Stacey is a proper noun, it is the name for a person. A person's name (real or fictional) is a proper noun.
Stacy Keach is an American actor and narrator. Stacey Jones is a famous Rugby League World Cup player in New Zealand. Stacey Schuett is a famous children's book author and illustrator. Several other authors incluse Stacey Richter, Stacey Ballis and Stacey Klemstein. Stacey London, fashion expert, TV's What Not To Wear
Robyn Stacey is famous Australian photographer.
Micheal Buble.
Stacey Winkler's birth name is Stacey Weitzman.
Stacey Behlmer's birth name is Stacey Endres.
Stacey Halprin's birth name is Stacey Harperin.
Stacey Sund's birth name is Stacey Ann Sund.
Ben Stacey's birth name is Benjamin Thomas Stacey.
Beth Stacey's birth name is Elizabeth Kate Stacey.
Phil Stacey's birth name is Joel Philip Stacey.
Vanessa Stacey's birth name is Vanessa Eve Stacey.