Considering

An x makes any name cooler, so that Baxter has a bit more pizzazz than the original Baker. Baxter had some currency as a first name a century ago--it was on the popularity lists sporadically from 1880 till the 1920s, peaking at Number 515 in 1886-- which means it's just about due for a comeback. And we can see Bax as a worthy follow-up to Max and Jax.

In the early 1990s, Cody was in the Top 25 most popular boys' names in the USA; but it has been in decline since then. It retains a greater degree of popularity in the UK, however. Cody might be short for Dakota but despite its nickname feeling, it's a name of its own.

Finn is a name with enormous energy and charm, that of the greatest hero of Irish mythology, Finn MacCool (aka Fionn mac Cuumhaill), an intrepid warrior with mystical supernatural powers, noted as well for his wisdom and generosity.

A common surname in Ireland that projects a complex image for a short-one-syllable name, combining spirit and substance.

Wren, a lilting songbird name, could be the next Robin. It makes a particularly pleasing middle name choice, as does her newly discovered cousin Lark. Wren entered the Top 1000 for the first time in 2012 and is among the new wave of popular English names for girls.

Short and to-the-point, it turns an ancient biblical name into a friendly cowboy.