Names from The Walking Dead

Last cool when Bogie roamed Casablanca.

This spirited Spanish variation of Rosa was familiar in the mid-20th century, but is used more quietly now. Given to around 35 babies in the US each year, it could work as a fresh alternative to Roberta or Rosie.

Sam has long been used on its own for boys, as accepted standing by itself as it is as a short form of Samuel. Straightforward and down-to-earth, Sam is the name of the son of the co-stars of The Americans, Keri Russell and Matthew Rhys. Sam is one of the most popular names that start with S in the Western world, ranking higher in several European countries than it does in the US, where it's trended downward since the 19th century, though it's always been in the Top 1000.

Sasha, largely male in Russia--and also spelled Sascha and Sacha--is an energetic name that has really taken off for girls here, chosen by Jerry Seinfeld (using the alternate Sascha spelling) and other celebs. The Barack Obamas use it as the nickname for their younger daughter, whose proper name is Natasha. But in line with a trend toward softer-sounding boys' names like Asher and Joshua and thanks to Borat star Sacha Baron Cohen, Sasha also still has life as a boys' name too--it's popular in France for boys and girls almost equally.

Shane ambled into the picture via the 1953 movie, adding a cowboy twist to its Irish essence. Shane is even more popular in Ireland than in the USA or the UK. Singer Siobhan O'Connor and actor Kevin Sorbo have sons named Shane.

Shawn is a phonetic spelling of Sean that may be past its peak – it was a Top 30 name in the early 1970s – but is still quite popular for boys: over 500 baby boys were named Shawn in the US in the most recent year counted vs 800 given the original Sean spelling.

Sophia, which was the Number 1 girls' name in the US from 2011 to 2013, is among the top girl names in the Western World, with a sensuous sound and high-minded meaning. A real winner, Sophia reached the top of the charts without losing any—okay, much—of its sophisticated beauty.

Despite a rich history in Irish myth preceding its plantation appearance in Gone with the Wind, widespread use in the seventies caused Tara to lose its Irish accent.

One of the first breakaway unisex baby names, Terry, used independently since the days of Terry and the Pirates. Popular in the mid-20th-century, it has fallen out of favor in recent years, replaced by Tommy, Sonny, and Ozzy.

Will has definitely replaced Bill, not only as a nickname for William but as a stand-alone name as well, partly thanks to England's Prince William, also known as Wills.