Though it is a Brahmin Gotra,it might have been modified as a Kshatriya Gotra because of change in Profession. Viswamitra Gotra is a Brahmin Gotra . But when Viswamitra became a Rajarishi and gave the Gayatri Mantra to the world his Gotra became Brahmin.
This post first appeared on Ramani's Blog | Education Health Hinduism India Li, please read the originial post: here