Brad Paisley and Kimberly Williams-Paisley
04/20/2009 at 05:00 PM EDT
and wife Kimberly Williams-Paisley have paid tribute to a special man when picking the name for their newborn son.
Jasper Warren Paisley, who was born in Nashville
on April 17, gets his middle name from the country singer's grandfather, who gave Paisley his first guitar and encouraged him to pursue a music career, the actress's rep tells PEOPLE exclusively.
Paisley, 36, and Williams-Paisley, 37, are also parents to 2-year-old William Huckleberry Paisley, who was named for Mark Twain's character Huck Finn.