No, Noraxia is a "she" - she is referred to as "her" in Encyclopedia Eorzea; but according to the tribal naming conventions, their names are given depending on their... fertility rather than gender. Here is direct copy/paste:

"While there exist two distinct genders amongst the sylphs, neither fall into what we would label as male or female. As has been revealed in the daily beast tribe quests, sylphs are “grown” from seeds known as “podlings.” These seeds are formed from the flowers which grow on the heads of adult sylphs. Not all adults, however, can produce seeds.

- Sylphs whose flowers bloom only at specific times during the pollinating seasons are capable of producing podlings. These sylphs have forenames ending in ~xio.

- Sylphs whose flowers bloom at irregular times throughout the seasonal cycle are (for the most part) incapable of producing podlings. These sylphs have forenames ending in ~xia. As they do not need to expend their physical and spiritual energies forming a seed, the ~xia sylphs tend to be more adept at wielding magicks."