This US state name has been rising slowly but steadily for girls over the last 30 years, but à la Dakota, it could easily be a male name too.

Arizona

Aza's similarity to the biblical name Asa makes it ripe for adaptation. If you want something more elaborate, you might consider Azariah. Something simpler?  It doesn't get much simpler and that is the beauty of Aza (or Asa).

Azul is the Spanish word for "blue" and was first recorded as a baby name (for girls) in 1995. It's technically considered unisex today, although it is still much more common as a feminine name.

Azul

Azure is a colorful choice for a blue-eyed child, recently chosen by Elon Musk for his daughter. Currently, Azure is used for American baby girls and boys in equal numbers. Among other blue-toned color name possibilities: Indigo, Cerulean, and Blue itself. 
 
In the Middle Ages, azure was another name for lapis lazuli, the gemstone used to make the brilliant pigment seen in much medieval art.

Azure

Amoz

Although Greek in origin--in the fourth century, a bishop by that name established the principles of the Greek Orthodox Church--Basil for years took on the aura of aquiline-nosed upper-class Britishness of Sherlock Holmes portrayer Basil Rathbone, then spiced with the fragrant aroma of the herb that entered with the Pesto generation.
 Now, it's time to take a fresh look at Basil.
 Basil was on the U.S. popularity list quite regularly up till 1970, reaching a high of Number 328 in 1904. Its history includes several rulers of the Byzantine Empire and Eastern Orthodox saints, including one whose grandmother, father, older sister and two younger brothers were all saints as well.
 Basil has also been seen as a figure of fun, as in the manic Basil Fawlty in the British TV comedy classic "Fawlty Towers," in the Disney movie "Basil of Baker Street," and as Basil Brush and Basil Wombat in other kids' entertainment.
 The Russian version, Vassily, is another possibility.

Basil

As Bas, it's a popular name in The Netherlands, but Baz, as in director Luhrmann, has potential for independent life too.
Curiously, Australian-born Moulin Rouge director Luhrmann was born neither Sebastian nor Basil, but had the name Mark Anthony on his birth certificate; his nickname arose from his supposed resemblance to a British TV fox puppet named Basil Brush.

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

Cozmo

More of an abbreviation than a short form that can stand on its own.

Dezmond

Ezra has a lot going for it: the strength of its heroic Biblical legacy, its quirky sound, and its fresh but familiar feel. Ezra is now at its highest point ever, but its intuitive streamlined spelling and deep roots could make it a worth successor to Elijah in the Top 10 -- or even to Liam or Noah at Number 1.
 Ezra just misses being among the elite group of male names that's always been in the US Top 1000, having dipped below the cutoff in 1964 and '67. Ezra also makes the Top 100 for boys in other English-speaking countries along with the Netherlands.
 Ezra is an abbreviation for the Hebrew phrase Azaryahu, meaning "Yah helps". In the bible, Ezra led a group of fifteen hundred Israelites out of slavery in Babylon and back to Jerusalem. 
 
Other notable Ezras include poet Ezra Pound and New York Times political columnist Ezra Klein. Ezra Cornell was a founder of Western Union and co-founder of the university that bears his name and Ezra Jack Keats is a popular children's book author-illustrator. 
 Both Paul Reiser and Taylor Hanson are dads to boys named Ezra, and there are Ezras to be found in Wilkie Collins's The Moonstone and Daniel Deronda by George Eliot.
 And let's not forget the band—Better Than Ezra—along with rising actor Ezra Miller, Vampire Weekend musician Ezra Koenig or the character Ezra Fitz from Pretty Little Liars.
 As unlikely as it may seem, Ezra is also growing in popularity as a girls' name, making the girls' Top 1000 in 2018 ad still rising. About 450 baby girls were named Ezra last year, but about 8000 baby boys, which puts Ezra below our 10% minimum to be considered a unisex name.

Ezra

Eliza

Haze

The charming vintage nature and color name Hazel has become popular for girls, but more than 30 baby boys were named Hazel in the US last year. In the olden days, Hazel was much more common for boys. It could shorten to cool nickname Haze or Hayes.

The hero of Richard Adams' Watership Down series is a buck rabbit named Hazel.

Hazel

Izaac

Multipurpose pet name serving Isidore, Isaac, Israel, and -- increasingly -- Isabel. 

Izzy

Unisex variation of Jazz or Jasper that couldn't say it more plainly.  Used for their daughter by tennis couple Steffi Graf and Andre Agassi.

Jazper

Kazey

Lyzander

One of the more unusual <a href="https://nameberry.com/list/329/nature-baby-names">nature names</a>, Maize is given to a dozen or so boys and girls each year and is almost completely unisex in terms of usage. Disclaimer: potential for "corny" jokes.

Maize

Marz

Maizie

Ozcar

Zach

Zachary, a Top 20 name throughout the 90s, is now sliding down the rankings though it remains in the Top 200. With its ancient roots and modern feel, it's easy to understand why Zachary has been such a longtime winner. 
 
Zachary is the English variation of Zacharias, which itself is derived from the Hebrew name Zechariah. The name Zachary is attached to eight different people in the Bible, the most prominent being the father of John the Baptist, and it's also presidential, via 12th president Zachary Taylor. Zackery is an alternate spelling, and nicknames include Zack, Zach, Zac, and Zak.
 
Sir Elton John chose Zachary for his long-awaited first child, which may help propel it back into the spotlight. But contemporary parents might want to keep looking for more original alternatives. Variations such as Zachariah and Zacharias may have longer beards but at the same time feel fresher, while other Z names—from Zebedee to Zane—may suit parents whose main attraction is to the initial Z. 
 
Several of today's prominent Zacharys go by short forms—Zac Hanson, Zac Efron, Zach Galifianakis, Zach Braff and designer Zac Posen.

Zachary

This phonetic version is occasionally used and removes any confusion about whether the X is fully pronounced or not.

Zavier

Crow Strasel's list "Z Names for Boys" of 32 great name ideas: Arizona - Zoe!

Z Names for Boys

Masculine and neutral z names. Izaac, Zavier, Zach, Zachary, Aza, Arizona, Amoz, Azul, Azure, Baz/Basil and more!