I am regularly asked what the name of the dojo -- Aikido'Ka -- means. Written and spelled this way, it's not a real word. We made it up.
Throughout most of the world, including the United States, the word aikidoka means someone who practices the art of aikido.
In Japan, the word aikidoka means a professional or expert aikidoist. In fact, one would rarely hear a native Japanese speaker use the term aikidoka.