Another name that is not overly used yet, is Mack. It remains out of the top 500 names in 2016 for a baby boy. It is commonly used as a nick name for names like Mackenzie, Maclin or Michael but it is more and more being used as a first name moniker for boys.  

However, I would note that whenever I hear this name my brain automatically goes to the character Mack from the children's movie Cars, or the rapper Macklemore, or just Mac and Cheese. This is one reason I am not 100% sold on the name JUST yet... but It definitely catches my attention every time I see it and it makes the list of names I may use one day if I have a little boy. 

[M(a)-ck]

Origin: Gaelic/Celtic