Jax is the Dex-Jex-Pax type of x-ending cool -- possibly too cool -- variation of Jack or nickname for Jaxon or Jackson.
 Jax was a soap opera character name way back when; most recently he's been seen as Jackson "Jax" Teller, the central character on Sons of Anarchy, the national president of the Sons of Anarchy Motorcycle Club.

Leo is a strong-yet-friendly name that was common among the Romans, used for thirteen popes, and is now at its highest point ever in the US thanks in part to Leonardo "Leo" DiCaprio.

Derived from the Latin meaning "lion", Leo is one of those names, like Luke and Finn, that many people assume must be short for something but that is authentically a complete name in its own right. That said, Leo can but short for any number of names, from Leonardo in Latinate languages to Leon and Leopold in Germanic languages. We've even heard of little girl Leonoras and Leonies called Leo: How cute is that?

Leo's simplicity makes it an international star, ranking in the Top 100 in countries as diverse as Ireland and Israel, Spain and Sweden, Austria and Australia. Leo is a truly diverse name, a perfect choice for any family crossing countries or blending cultures.
 
Leo's only real downside is its universal popularity and familiarity. If you call your child Leo, you and they will almost certainly encounter many other Leos over the years of all types and ages. Plus or minus? Or both?
 
Penelope Cruz and Javier Bardem called their son Leo, as did actress Kim Raver, NASCAR driver Jeff Gordon and Kristin Olson. 
 Famous Leos of the past include Pope Leo the Great, a number of early saints, and Leo Tolstoy, as well as Dead End Kid Gorcey, colorful baseball manager Durocher, influential gallerist Castelli and the leonine MGM icon. There have been Leos seen on everything from The West Wing to Charmed to Grey's Anatomy to Seinfeld's Uncle Leo.

Noah is nearly a patriarch of popular baby names at this point, going from Old Testament graybeard to Top 10 name in 2009, hitting Number 1 in 2013, and now settled into second place in the US for the past seven years. 

Noah was derived from the Hebrew name Noach, which itself came from the root nuach, meaning "rest." In the bible, Noah was deemed the only righteous man of his time, singled out by God to survive the great flood sent to punish the world. He built his famous ark, onto which he herded a pair of every animal.
 
A generation or two ago, Noah seemed far too antiquated to become a popular name. But now, along with brethren Abraham, Moses, and even Elijah, it's eminently baby-worthy. 
 
Noah's popularity is widely international, ranking highly in all English-speaking countries along with France, Germany, Italy and Spain. Noah is also a top name in countries as diverse as Belgium and Brazil, Norway and Chile.
 
Actor Rupert Graves and singer Michael Buble both have sons named Noah. Billy Ray Cyrus, responsible for the name Miley, crossed gender lines to call another of his daughters Noah. 
 
The feminine homonym Noa -- which isn't a form of the Biblical male Noah (it's a separate female name from the Old Testament) -- is currently the most popular girls' name in Israel. And Noah itself, with its vowel ending, is evidence of the trend toward softer sounds in boys' names, along with brothers Joshua and Asher.
While variation Noa is an actual girls' name drawn from a female figure in the Bible, it is sometimes used as a sleekened spelling of Noah.

Noah

hannahbunn's list "First Boy Names" of 3 great name ideas: Jax - Noah!

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