I have very good experience with this site:
http://www.namegenerator.biz/game-name-generator.php
It’s ment to generate names for computer games, they are unique and free, and can be used for servitors IMO.
Good luck!
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I’m going to experiment with this to create some sigils. Thanks for sharing.
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I’m glad you find it useful. It’ really good for many other things. I started for servitors, I’m runnig out of inspiration for names some times 
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