Export multiple objects to wavefront in certain order


I’m doing a Map using 3D Tiles.

I made about 10 square tiles (grass, sand, palm, water…) and now i want to export all of them to a wavefront file.

The problem is, blender exports objects in strange order, for example, the objects are named:

Tile0, Tile1, Tile2… Tile10.

But if you look at the exported .obj you see:

o Tile8

o Tile9

o Tile2

o Tile5

o Tile0

I need the objects to be exported in correct order so that i can load them for my maps.