[mdtrooper]

In Spain we have 2 last names:

- first last name from last name first of the father.

- second last name from the last name first of the mother.

And with this method we have collisions.

In Portugal the last name come from the mothers.

[luckys]

In Portugal you can have one or more last names, but the very last one will be from the father's side. Unless both parents have the same double-barreled name? Never seen that here.