It was either '97 or '98 that GM dropped the "Geo" name, and started selling them as "Chevrolet Trackers" through 2003.
chevy bought geo in 96, they rebadged it to chevy in 98. But if you look closely at the geo badge on the front grille on the 96-97 theres a little chevy bowtie in the middle.

Uhhh, no sorry dude. Geo always was, and never was, Chevrolet. Chevrolet never bought Geo. Geo was created by GM to have different badging to put on Toyota's(Prizm) Suzuki's(Metro and Tracker) and Isuzu's(Storm), and sell them as low cost options on Chevy lots. As of I beleive 97 or 98, they decided that selling these cars under the assumed Geo name wasn't a good idea, but continuing to rebadge the competition's vehicles and sticking them on their lot was *scratching head and furrowing brow*, so Geo is then nixed and the Tracker, Prizm, and Metro carry on as Chevrolets from that point on, until eventually replaced with original GM engineered models. Although I am not 100% sure, I don't beleive there to be any corrolation between the demise of Geo, and the change from Sidekick to Vitara. I'm pretty sure that changed when they went from squarish to jellybean bodystyles, while I distinctly remember the Chevrolet badging already on a squarish bodystyle. As far as the logo goes, that was the logo on every Geo. The Lattitude/longitude around a Bowtie...the whole idea was Chevrolet cars...from around the globe.ÂÂ
  And I'll end the post with my typical rant. Not that it's important techincal information that could ruin someones rig or get them hurt, but I'm still very disappointed with the misinformation flying around this thread. Come on Zukiworld, lets keep the QC intact here. To redeem my faith, can someone tell me what vehicle now carries the torch as the last rebadged vehicle sold as a Chevrolet? (hint, it really did have the torch passed to it because it was introduced in the 2004, officially the last year as the Tracker, and like Tracker it has Suzuki DNA.)