Well, the former Dawson's Creek actor's wife, Kimberly, has been kind enough to finally reveal that little tidbit of info.
On Wednesday, Kimberly shared the couple's newborn son's name in her new blog for People.
"Earlier this month, we had the pleasure of welcoming our son Joshua (you've heard his name here first!) into our family," she wrote. "This new life has brought about new joys. It's hard to top hearing your baby's heartbeat for the first time, finally holding them in your arms and nursing them, or trying to cook while they're hanging from your legs."
James and Kimberly, who tied the knot in 2010, also have a 17-month old daughter, Olivia.