I know this isn't what you are exactly looking for, but it can help if you are wanting to make a name for something down the line. And while not actually having the word Arthro, there are still words that relate to arthropods.
Look at the scientific names of insects, or the insect that closely relates to your race and change it slightly. But remember, that a name needs to be easily said and read. Ask a friend or family member to try and say it without you telling them how you would pronounce it. If they struggle with it or cannot work it out, you might need to change the name. You don't want you poor readers trying to figure out how to say arcathioloidanites.
Examples would be:
Sparanites - Family of Huntsmen Spiders - Sparassidae
Puntatians - Seven-Spot Ladybird - Coccinella septempunctata
Vespins - European Hornet - Vespa crabro
But yeah, I mean you can be really creative going this route cause you can just mull through some insect names and find one that sounds cool and make it sound like a species. And it isn't that hard, I literally just googled these insects and came up with these names in a few seconds.
You if you spend a little longer on them unlike me, you can make some pretty neat and unique sounding names.