Rear end clunking noise over small bump

Wind......yes, only if something is loose and swinging around. Check the stabilizers as they often cause a clunking sound and is more pronounced when going over bumps, even small ones.

Broken spring.

at the rear of vehicule look for place that are visuel that it is touching exhaust pipe near suspension
only a guest hope it helps

Check for leaking rear shocks or a loose sway bar.

universal joints clunk,is it in the rear end then maybe it is the rear end.you kinda need to be more specific if this information doesn't help

If it sounds like a rumble from back wheels it may be the rear end going out. Mine has been replaced twice with used rear end. You should be able to confirm it by looking at the rear tires both sides of tire for an oil leak or wet spot on tire or rim.

The noise is caused by the axle button being worn out, this lets the axle move back and forth and clunk, this is a unique problem with C clip retained axles, it is a noise issue but will not fail and cause any more damage, in order to fix it you must have the axles pulled and the diff carrier checked for excess wear where the axle retainning C clip rides, if the carrier is ok then replace the axles.

Take a good look at your front struts. With your hood up, bounce your car and see if you have any movement of the top nut on the strut tower.

i had the same problem, i found out that both rear torque arm bushing are filled with liquid grease, when they go bad all the grease comes out of them and then the metal sleeve inside the bushing starts the hit the bolts, when you hit a bump. that was the loud noise, that i had.