Overall, Onyx can be a fairly unisex name, but I wondering what was the main connetation people had? I was discussing the Onyx stone with my boyfriend, who remarked that it would be a cool name. Further discussion established he would use it on a son, while I think its more suited to a girl. Perhaps the
Nyx part remind of the deity, or Nixie would be a cute nickname, but for me it is edgy but feminine. What do you guys think?