Fast Sprites Extraction from Sprite Sheet

Hi,

I was working on a game and i realized that I've around 100 sprite sheets and i will have to use them and to use them i'll have to cut them. All of them are of same size i.e. 750 * 75. I want to cut them but unity's sprite editor feature is taking time. Actually i want to cut them but i also want that the sprites which are cut down have same name for all sprite sheets.

 like there are sprite sheets with name
 tree, plant
 
 sprites from tree sheet must have name T1,T2,T3....T10
 sprites from plant sheet must have name T1,T2,T3,...T10
 
 i.e. name of sprite sheets are different but sprites must have same name.

I need these in this way cause i am using sprite sheet animation and by doing this i'll be able to change animation characters without creating animations separately for all sprite sheets. I've script for that. So if somebody knows a fast way to do this please help me out on this.