It isn't listed in the database, but it's a legitimate boy's name, as seen by the existence of St. Artemas of Lystra, Major General Artemas Ward of the Revolutionary War, and CKE's post here:
http://www.behindthename.com/bb/arcview.php?id=704059&board=baby
I'm digging it right now--both the sound and the nn Art / Artie. WDYTO Artemas? (I'm currently pronouncing it just like Artemis, namely AHR-tuh-miss, though I'm not at all certain that's correct.) Artemas Ray, Artemas Riley, Artemas Robert? Morpheus and Artemas, Evening and Artemas, Artemas and Ptolemy? :)
Any and all thoughts are appreciated. Thanks.
Array