Of course it's considered a martial art, just a "European martial art". We do tend to think right off the bat that only the asian varieties fall under the heading of "martial art" due to our general exposure in the media, but anything that deals with warrior code, so to speak, can fall under a martial art.
And to back me up, here's merriam-webster definition:
Etymology: Middle English, from Latin martialis of Mars, from Mart-, Mars
1 : of, relating to, or suited for war or a warrior 2 : relating to an army or to military life 3 : experienced in or inclined to wa
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