Arjen Anthony Lucassen (born 1960), composer and musician from the Netherlands
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Arjen Robben (born 1984), Dutch footballer who plays for Bayern Munich
Coincidently, Tobias was also mad at Arjen because he had Bruce Dickinson (Tobias' favorite singer) performing on his Ayreon album Universal Migrator Part 2: Flight of the Migrator and the media's constant queries about his thoughts on Ayreon after the creation of his Avantasia project.
A very recent discovery by a group of astronomers led by Dr Arjen Van der Wel from the Max Planck Institute for Astronomy in Heidelberg, Germany, the results of which are accepted for publication on Oct 21, 2013 in the Astrophysical Journal Letters (arXiv.org).