You can change the default category to any alternate name you choose.
November 02, 2015
If you find that WordPress' default category name is pointless, don't ignore it or hide it -- rename it!
FOLLOW THESE STEPS
1. Enter your admin dashboard
2. Navigate to POSTS » CATEGORIES
3. Find "Uncategorized" and click its EDIT link (notice that it cannot be deleted)
4. Edit its Name, Slug and Description fields . . .