He is American.
I don't think the side has much signifigance due to the fact it varies depending on region, nationality, etc. Here's some meanings for the ones in North America. Filled in tear drop can signify the loss of a loved one being a family member or close friend. One that is half filled in, empty at the top means that he or she avenged the murder of a loved one or close friend. And a empty one can either mean that a loved one or close friend was murdered. Or that he or she killed somebody.
Peter Keefe's birth name is Peter Eugene Keefe.
Darren Keefe's birth name is Darren Keefe Reiher.
Zena Keefe's birth name is Keefe, Zena Virginia.
Keefe Maley's birth name is William O' Keefe Maley.
Sheldon Keefe was born in 1980.
Dave Keefe died in 1978.
Dave Keefe was born in 1897.
Mike Keefe was born in 1946.
Jim Keefe was born in 1965.
Emmett Keefe died in 1965.
Emmett Keefe was born in 1893.
Keefe Cato was born in 1958.