Indeed. The posted list adds up to 15 if you include the three later students, so I don't think he meant them as part of the 12.

*Corran Horn (under the alias Keiran Halcyon)
Kam Solusar
Brakiss*
Gantoris*
Streen
Tionne
Dorsk 81*
Kirana Ti
Kyle Katarn
(unknown student #1)
(unknown student #2)
(unknown student #3)
Mara Jade
Kyp Durron
Cilghal
*

Mara Jade was not one of the original twelve, and neither was Kyp. Kyp came when gantoris died, and so did mara, raising their number to thirteen. How do I know this?
"Within a week, the rest of the Jedi candidates had reached the academy... making our number an even dozen
I, Jedi pages 94-96

Wow, I knew about Quin and Shada, but not the others. That's cool.

This is getting kind of off-topic though...

I know that Quin Vos is in Ep 1, where r the rest?

Page, just like Tycho Celchu was retroactively included in RotJ. But unlike Tycho, Page was part of Han Solo's ground attack force. Apparently Bren Derlin, better known as Cliff Claven, was part of that team as well.

Never heard of most of the others. Might be PT characters. I haven't read any of the PT novels, basically because I wasn't that impressed with the first two episodes.

I'm only halfway through I, Jedi, but don't recall Kyle's name popping up.

It isn't; he's first mentioned as attending the Academy in The Essential Chronology.

And there is no way he could be included in the original JAT since it came out before Dark Forces, and that was where he made his first appearance.

Yep. The originaly JAT only mentioned six of the twelve in the first class; Anderson left the rest unnamed so later authors could "plug in the holes" as needed, which Stackpole wound up being the first to do.

*Is this another case of using an existing situation to provide backstory, like Tycho in RotJ?
*

Yep. It's actually pretty common; you'd be surprised how many semimajor EU characters (Quinlan Vos, Shada D'ukal, Lt. Page, Walex Blissex) are actually in the movies as background characters - in the cases of Page and Blissex, retroactively.

Only the guesses I've already made in this thread and others.

~JTS

I know its been a while since this topic was discussed, but I found myself trying to come up with this list myself while re-reading I, Jedi.

I really don't have any solid evidence to help here, but I do have a question.

We know for a fact that we can name 8 (9 if you count Kyle Katarn).
The first three to arrive
1. Corran Horn, aka Keiran Halcyon
2. Kam Solusar
3. Brakiss
The rest of the 12
4. Gantoris
5. Streen
6. Kirana Ti
7. Tionne
8. Dorsk 81
9. Kyle Katarn
The last 3 are as yet unnamed.

I'm only halfway through I, Jedi, but don't recall Kyle's name popping up.
And there is no way he could be included in the original JAT since it came out before Dark Forces, and that was where he made his first appearance.
Is this another case of using an existing situation to provide backstory, like Tycho in RotJ?

3 of the original 12 seems to be too many to leave unnamed. I'm wondering now if JTS has anymore info on this.

Wouldn't Luke consider Halla for training? And what about Dal Konur?

D'ganin:

it is highly unlikely that anyone survived the purging and joined the Academy (at least through the end of the NJO). remember, Luke still has only the holocrons to turn to for knowlege about training...

Except we know some Padawans did manage to escape the purge - Corwin Shelvay, for example. Heck, Kam Solusar even had some training from Ranik Solusar, so we know at least some remnants of the late Old Jedi Order made it to the Academy.

My guess is that most of the survivors were trained by Masters who were on the fringes of Jedi thought - Corellian Jedi, for instance, and those who rebelled against the No Marriage or One Padawan Only doctrines. These are the sorts who would have had minimal contact with the rest of the Jedi, and thus the Sith knew the least about them, while simultaneously explaining why so many of the Old Order Jedi seen in the Original Trilogy era and later didn't follow Jedi rules to the letter.

What about Nyo and Kinnin Vo-Shay?

I don't believe Vo-Shay was Force Sensitive. He'd learned a few lightsaber katas from Aryzah's spirit, but I think that's it.

SWAJ#13, the original source for the story, backs me up on this; its game stats for the characters in The Last Hand show Nyo as being Force-Sensitive, Vo-Shay as not.

However, Nyo might be among the original twelve . . . but I tend to think he studied under Aryzah, rather than going to the Academy.