Google recently updated their policies with regards to name changes. Previously, you were required to contact them. However, under the new policy, as long as your nonprofit status and mission remains the same, you can continue to market your website through the grants program without written notice to Google.

The new policy can be found here: http://www.google.com/support/nonprofits/bin/answer.py?hl=en&answer=1657899&topic=1686136

All the best,