As far as I know, you cannot legally block the name "G-Force" as a brand. If you wnat to protect it, you have to link it with an area of use, e. g. sporting goods, bowling balls or nuclear warfare.

Then, you will have to register your trademark for a region or country. In some areas like the EC you can have a legal protection for the whole region, but most of the times you will need to have national protection with individual registrations - costly and very time consuming.
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DizzyFugu - Reporting from Germany
"Put some make-up on your face -  Make this world a better place!"
Kahimi Karie, 'Good morning world'

if a company were to copyright or trademark a name on a bowling ball they could effectively block any otherbowling ball company from using the same name

enough said
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www.bowlingballexchange.com

Triggerman

F.O.S Loud, F.O.S. Proud

Lane #1 Baby