Is there another name for "terminal ground bar"?
Ground-bar is correct. But online purchase source may be better choice.

https://www.amazon.com/mn/search/?_encoding=UTF8&amp;tag=theelectricbrewery-20&amp;linkCode=ur2&amp;camp=1789&amp;creative=390957&amp;rh=i%3Aaps%2Ck%3A10%20terminal%20ground%20bar%20kit&amp;field-keywords=10%20terminal%20ground%20bar%20kit&amp;url=search-alias%3Daps&amp;ajr=0


Siemens ECGB10 Ground Bar Kit with 10 Terminal Positions
Square D by Schneider Electric PK23GTACP 23 Terminal Load Center Ground Bar Kit
PK3GTA1CP 3" Terminal Ground Bar Kit


or 

POWER DISTRIBUTION BLOCK 
http://www.digikey.com/product-detail/en/adafruit-industries-llc/737/1528-1520-ND/5774323