In my country, we use both names, our father and mother's last name.
This is our family crest, from the mountains, to be kings, based always in God, always drinking coffee. This is our family.
One of out favorite quotes is "En todos lados se cuecen nabos", translated is something like "Every single place has peas"... But a "nabo" is a kind of pea that only happens to grow in Boyacá, the place my family is from... That's why we say it, and laugh...
We are all unique.