Read or heard 9/25

Though this feels like a modern invention, Jay has been in use for centuries. Early Jays often were named in honor of founding father John Jay, whose surname derived from the jaybird. A popular mid-century choice, Jay was in the Top 100 from 1956 to 1970. In the last couple of decades he was replaced by such more elaborate forms as Jayden, Jaylen, and Jayce. But Jay could make a comeback in tandem with cousins May, Kay, Fay, and Ray.

This nickname for popular and traditional Joseph has a long history of being used as a given name all on its own. Nonetheless, everyone will always assume that Joey is short for the longer form. It might be nice for a potential son to have the option of a more professional and classic name to fall back on.

John reigned as the most popular of all boys' Christian names for 400 years, from the time the first Crusaders carried it back to Britain until the 1950s. Then American baby namers finally seemed to tire of this straight-arrow, almost anonymous John Doe of names, replacing it with fancier forms like Jonathan and the imported Sean and Ian.

Jonathan was derived from the Hebrew name Yehonatan, eventually contracted to the modern Yonatan, meaning "gift of Jehovah." It comes from the elements yeho, in reference to God, and natan, meaning "to give." In the Old Testament, Jonathan was the valiant eldest son of King Saul, and it was his friendship with brother-in-law David that gave rise to the expression "Jonathan and David" to describe devoted, steadfast friends.

Originally used for children baptized in holy water from the river Jordan, it became one of the leading androgynous names of the nineties. As the balance tips toward the boys' side, it's slipping on the girls' popularity chart. Alternate spelling Jordyn is now more popular for girls.

Wildly popular in the 1960s and '70s, Julie is no longer anywhere near as stylish as the name's longer forms. Try Juliet, Juliana, or even the more grownup Julia.

Kaitlin is a variation of Caitlin that's on a steep decline; it dropped out of the Top 1000 in 2013, after more than three decades on the list.

Kate, in the headlines via Catherine Middleton aka the Princess of Wales, has been as pervasive as Kathy was in the 1950s and 1960s, both as a nickname for Katherine and Kaitlyn and as a strong, classic stand-alone name.

Kayla is a modern invented name that emerged in the late 1950s. Despite its similarity to the name Michaela, Kayla most likely began as a combination of the then-popular name Kay and -la suffix. Alternatively, it may be a variation of the Yiddish name Kaila, which derived from the Hebrew name Kelila. Kayla can also be considered an Anglicization of the Gaelic surname MacCaollaidhe or MacCathail.

A widely used name, Kaylee pulls together something from Kayla and something from Hailey, yet somehow loses something in the process. It has surpassed cousin Kayla on the charts and is one of three girls' names starting with Kthat ranks in the US Top 100.

The -leigh suffix seems to be losing its luster; several names in this category, including Kayleigh, Kyleigh and Ryleigh, peaked in popularity a few years back but have since lost quite a bit of ground.

Keely is well-used in modern Ireland, also found as Keeley and Keela. The boys' form is Keelan. Largely unknown in the US, this could make an interesting update for Kelly or Kaylie or Kylie -- though it might ultimately prove to close to one of those trendy names.

Once the quintessential bouncy teenager name, Kelly helped launch the trend of unisex Irish names . But it now takes a backseat to more substantial surname names like Kennedy.

Kent is a no-nonsense, brief, brisk one-syllable name, almost as curt as Kurt.