There are a lot of bikes that have popped into this segment over the past 10 years, whereas the market was essentially void of them during the 90's. The name is a challenge because there really seem to be subsections of the group.

Sport Standard - A standard that has been given some sport features, but essentially started life as a standard.

These were the original sport bikes. Take your standard motorcycle, make it a little faster, put bars a little forward, the pegs a little back, and you have the sport standard.

Kawasaki ZRX would be the best example for this.

Naked - Sportbike converted into a more ergonomically pleasing form.

This was the name assigned to the segment back around 2000 or so. Essentially a sportbike redesigned to run bars rather than clipons, and bodywork all but removed.

Aprilia Tuono, Suzuki Bandit, Earlier Buells like the X1, S1

Streetfighter - Originally a sportbike custom, bodywork removed, clipons retained small headlights with minimal or no fairing, that turn with the bars. Common conversion after a sportbike wreck.

These came about with full faired sportbikes, as a way to keep riding your cosmetically damaged bike, and evolved into a new bike offering. Retains sportbike ergonomics.

Kawasaki Z1000, Ducati Streetfighter, Buell XB's

Ergo-Sport - A combo of the seating comfort of a Naked / Sport Standard but built as a sportbike. Retaining a fixed upper with windscreen, and almost complete bodywork. Usually has a almost identical sport counterpart.

Newer generation Aprilia Tuono, Yamaha FZ1

My choice would be that the EBR 1190SX fall into the ergo-sport category. On the street, I prefer the performance of a sportbike without the discomfort of low clipons and high pegs. Sitting upright allows for better visibility, easier low speed handling, and more long distance comfort. These are bikes you can take to the track, and all you have to do is bend your elbows a bit. I like to call them a gentleman's sportbike.