hueco is the same as ollo in English hueco is hole.

hueco = hole

Hueco mundo means empty world.

No, maybe there's a place somewhere called hueco mundo but hueco mundo as seen in bleach is definitely NOT real

No tbh your wrong people have different beliefs but hueco mundo is real. in my opinion but its not through the skys more or less here how do you know were not in hueco mundo or underneath us is huece mundo :)

I thought of this as i thought it was strange to choose a odd name for a place

hueco