Board Thread:Questions and Answers/@comment-24046886-20131013143802/@comment-1705035-20131013163317

This is mainly the joke to Negima. And I think Hata-sama didn't plan to make that too many characters like Ken-sama. So I think we can't find the name of all 31 students. We can only tell who of the some students according to hint. The others are just the jokes. This is all I can recall.
 * 2. I think she should be Risa Asakaze
 * 5. Not sure, May be Miki Hanabishi
 * 5. Absolutely Koutarou Azumamiya
 * 7. Absolutely Hinagiku Katsura, this is also the Negima joke that Misa Kakizaki, Student No. 7 of 3-A Class share the seiyuu with Hina
 * 14. Should be Wataru Tachibana
 * 21. Absolutely Aika Kasumi
 * 27 & 31. Not sure, May be Segawa Twins

Also Hayate and Nagi positions are jokes, too. Hayate share the seiyuu with No. 20, Kaede Nagase. And Ojou-sama share her seiyuu's surname with the surname of No. 11 Madoka Kugimiya