If you love one-syllable names...

The name of the sun god of Egyptian mythology could only be used in combination with a longer name.

All the old ae/ay middle names for girls are back--Kay, Fay, Mae/May, --and Rae is one of the coolest, used as such by celebrities as Mark Wahlberg and Daniel Baldwin. Even more popular in the celebrisphere is the jazzy Ray spelling: among those who used it as their daughters' middles are Bruce Willis, Dermot Mulroney, Maggie Gyllenhaal and Peter Sarsgaard, Uma Thurman and Lee Lee Sobieski.

Used almost exclusively in England; would make an equally amiable short form here for Raphael or Rafferty -- and could also stand on its own. If you're looking for boys' names starting with R, this is one of your cooler choices.

Among a small shower of rain-related names, this pure version can have a cool, refreshing image.

Attracted attention as the stepmother of Princess Diana.

Ralph has two diametrically different images: there's the suave Ralph Fiennes-type Brit (often pronounced Rafe), and then there's the Jackie Gleason blue-collar, bowling blowhard Ralph Kramden bus driver. It's all in the eye of the beholder, though its hip factor did rise when it was chosen for his son by cool U.K. actor Matthew Macfadyen.

Simple, short, and cool, Ray gives off retro vibes thanks to its 20th century popularity, and its links to jazzy Ray Charles and Ray-Ban sunglasses. A popular middle name for boys, it is well established as a given name too.

Rayne is the unique name used for one of the girl sextuplets on the Sweet Home TV show.

Fiery but slight middle name choice; much more apt to be a redhead's nickname.

This is the second most common boys' version of this attractive name, after the Welsh original Rhys. Reese takes the lead on the girls' side. thanks to the famous Ms. Witherspoon.

A slim, elegant, silvery surname, Reed could be a banker or a sculptor, and therein lies the appeal of this simple yet distinctive name. The versatile Reed can be seen as a grass-like nature name and a musical name.

An Anglicized spelling of the Welsh Rhys, this traditional boys' name got a big boost for girls in the early 2000s, thanks to the high-profile Ms. Witherspoon (who was actually born Laura Jeanne Reese, her second middle being her mother's maiden name). This spelling has been on the decline for boys since 2003, possibly for the same reason, but remains a strong, simple choice which might pose fewer spelling and pronunciation issues outside of the UK than the Welsh original.

Reeve is cool and dignified, sophisticated and modern — an excellent combination of assets, and a name being seen as a more masculine and distinctive alternative to Reese.

The Reid spelling is the most popular by half, probably because it feels more like a name than Reed, which looks more like a word. It's used occasionally for girls but this name is firmly in the boys' camp.

Reign is one of a new, ahem, kingdom of word names that suggest a high-born child, joining Royal, Lorde, Titan, Saint, King, Princess, and Noble. We predicted this kind of defining name to be the Number 1 baby name trend of 2015...two weeks before Kourtney Kardashian and Scott Disick named their third child, a boy, Reign. Reign is as appropriate for girls as for boys. The female version is often spelled Rain -- or Raine or Rayne -- though that makes is more nature and less royal word name. Reign entered the US Top 1000 for the first time in 2016.

Now that many dogs are named Max, it's safe to use this sleek, solid, regal name again for your child. And with the charm of its final x, its regal meaning, and its offbeat simplicity, Rex is definitely one to consider.

Rhett has been more tied to Gone with the Wind than even Scarlett, but now we're hearing rumblings of its finding new and independent favor among parents, perhaps emboldened by the growing popularity of Scarlett.

There's Rhys and there's Reese (now more popular for girls) and there's Reece, and we particularly like the traditional Welsh spelling, which entered the list in 2004, possibly influenced by Jonathan Rhys Meyers, of The Tudors, and Welsh-born actor Rhys Ifans.

Like Papa name Rudolf, Rolf never quite emigrated from the Bavarian Alps. You might want to move on to Rollo or Wolf.