Though perhaps not as currently stylish as Ruby, Jade, or Pearl, Amber has a colorful history (remember the notorious Forever Amber heroine?). Unfortunately, it does come with the "Amber Alert" connotation for modern parents (and their children).

Amber

Ash has Southern charm plus the arboreal-nature appeal. Plus your little boy will prize Ash as the name of the hero of the Pokemon cartoons. Ash can also be a dashing short form of Asher, Ashton, or any other "Ash" name.

Originally a form of the saint's name Blaise, though now more likely to be a hot word name used for both sexes, though heavily weighted toward the boys. It has been in the boys' Top 1000 since the year 2000.
 br>On the pop culture side of things, Blaze Bayley is a singer and musician who has been connected to the bands Wolfsbane and Iron Maiden.

Blaze

Blythe originated as a nickname for an upbeat person, coming from the Old English word bliðe, meaning "merry" or "cheerful." Today the homophone blithe shares the same meaning. Blythe was eventually adapted to a surname before it became a feminine given name.
 
Blythe embodies a cheerful, carefree spirit and could be the next Blair/Blaine/Blake/Brett/Britt, with the advantage that it's clearly pink. It joins other other light-hearted names for girls: Felicity, Hilary.
 Blythe is the middle name of Drew Barrymore—in her case a surname from her rich theatrical history.
 The title of the memorable Noel Coward play Blithe Spirit is taken from Shelley's poetic line, "Hail to thee, blithe Spirit"—a nice tribute to a baby Blythe.

Blythe

Bright is a rare yet intriguing word name used for a female character in Ann Patchett's novel The Dutch House.<,/em >

Bright

This recently coined respelling of Cole darkens its image. 

Coal

Cinder

The Kimberly of the current age, but currently less popular than either Ember or Everly.

Emberly

Etna

Long before the vogue of using Irish surnames for girls, writer Flannery O'Connor gave this one some visibility. It has a warm (flannelly) feel and the currently popular three-syllable ee-ending sound. 
Mary Flannery O'Connor was an important twentieth century regional writer whose work has been characterized as Southern Gothic, often featuring grotesque characters and concerned with questions of morality.

Flannery

Flint is one of the new macho names on the rise today, part old-school tough guy, part rebel. You won't find a tougher, steelier-sounding name; it's part of a genre on the rise along with cousins Slate, Stone and Steel. 
 Flint found itself on the popularity list for a few years in 1959-60, but would prove a distinctive choice today.
 Flint has superhero overtones--there's one in "Spiderman"--aka Sandman--and Captain Flint was a Marvel comic, and Flint is both a legendary pirate and a parrot in Robert Louis Stevenson's Treasure Island. But on the softer side, there's also inventor Flint Lockwood in Cloudy With a Chance of Meatballs.

Flint

Fawkes

Flare

Originally a unisex nickname for a redhead -- red hair is called "ginger" in Britain -- or for the name Virginia, Ginger perennially wears pink gingham and spike heels. 

Ginger

A shimmering day name, with a bit of hippie residue. 

Light

Phoenix rolls a lot of cool trends into one: it's a place-name and a bird name, it ends in the oh-so-hip letter x, and as the mythic bird that rose from the ashes, it's a symbol of immortality. 
Phoenix is a fairly evenly-balanced unisex name, though it tilts slightly to the boys' side. Last year, it was given to 1300 baby boys and 1000 baby girls.

It's also got celebrity chops, via the acting family that includes Joaquin and the late River, and as the son of Paris Hilton.

Phoenix

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

Ruby, vibrant red, sassy and sultry, outshines other revived vintage gem names, with its sparkling resume of cultural references. Ruby is proof of the 100 Year Rule, trending again for the first time since its last heyday in the 1920s.
 Ruby is an early rock classic -- think the Rolling Stones hit "Ruby Tuesday" --and other songs like "Ruby, Don't Take Your Love from Me." She's appeared in such works as Cold Mountain and been associated with performers like Ruby Keeler (born Ethel) and Ruby Dee. Chosen by Tobey Maguire and a number of other celebs, Ruby makes a cool yet warm choice.
 For the past few years, Ruby has been a huge hit across the English-speaking world: right now she's popular in Australia, in England and Wales, and in Ireland. Her highest point in the US was from 1900 to 1936, when she was in the Top 50--but she could surpass that number if enthusiasm for her continues to grow. 
Another plus: Ruby is one of those <a href="https://nameberry.com/list/339/vintage-baby-names">vintage baby names</a> that feels totally modern.

Ruby

A beautiful and evocative place-name that deserves wider use. 

Sahara

Although pinochle-playing partner Sam came out of retirement, we don't see it happening to Sol. Near soundalike Saul has more of a shot.
Sol was also a Roman god/personification of the sun, and an epithet of sun-god Apollo.

Upbeat nickname-name that can't help but make you smile. You might want to use it as a short form for a more "serious" name such as Sunniva, but Sunny is undeniably, well, sunny.

Sunny

sugarhit's list "Fire/Heat/Sun inspired baby names." of 21 great name ideas: Amber - Sunny!

Fire/Heat/Sun inspired baby names.

Turn up the heat with these fire-based baby names!