Girl and boy - I

Ira is one of the shortest, non-biblical sounding Old Testament names, belonging to one of King David's thirty 'mighty warriors.' It was widely used in the US from the 1880s to the early 1930s (it was Number 57 on the Social Security list in 1881), but fell off completely in 1993. Although Ira is also a retirement-account acronym, it's back on the table for those seeking a short biblical name for their sons, and reentered the US Top 1000 in 2016. A musical namesake is lyricist Ira Gershwin (born Israel), a literary one is Ira Levin, and there are two prominent Iras hosting NPR radio shows.

Iria is a diminutive version of Eirene / Irene and is therefore associated with the Greek goddess of peace.

Iris has so much going for it. It's a fashionable flower name. It's a mythological name, from the Greek goddess of the rainbow. And it's a classic name, always ranking in the girls' Top 1000 but now at its highest point ever.

One fewer L makes this name much less popular than the more traditional spelling.

The quirky, offbeat and energetic botanical name Ivy is enjoying a deserved revival, propelled even higher by its choice by high-profile parents Beyonce and Jay-Z for daughter Blue Ivy. Ivy is also traditionally used at Christmas, make this one of the perfect names for December babies.