I think it’s only pretentious if you secretly don’t like it, but use it anyway thinking it might impress people (god knows which people). If you love it, and thus use it, there’s no element of pretentiousness. I love it. I’d be delighted to meet an Artemis. There does seem to be a bit of confusion with a lot of people about whether it’s a boy or girl’s name though.
My daughter has a name which some people probably think is a bit pretentious. I couldn’t give a shit what they think, bloody plebs. 