Jason, the Number 3 name for the entire decade of the 1970s -- thus the title of our original baby-naming book, Beyond Jennifer & Jason -- is more likely to be dad's name now than baby's, but it's still a widely used name.

Part Jason, part Jayce, this name has been among the Top 500 names for boys near-consistently since the late 1960s. While it's a reasonable spelling especially if you're naming your son after someone named Jay or another name that starts with the letter J, it's one of those names that will eternally need to be spelled out for people. But then again, so are classics like Elisabeth and Sara and Jon.

Quirky form of Ishmael found in Nordic countries.