The name Kristen is a girl's name of Danish origin meaning "a Christian". Kristen and is often added to lists like International Variations of Christina and discussed in our forums with posts like "This or That, Girls".
From the experts:
Kristen may be somewhat past its fashion high point, but it remains forever crystalline clear. Possible problem: confusion with the similar Scandinavian names Kristin, Kirsten, Kirstie, et al.
Current celebrity bearers include Kristens Stewart, Wiig, and Bell.