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I don't find it "curious" at all, rather logical.
One is son of their father and mother's. So, it's logical --and not curious-- one to bring both surnames.
I find the portuguese way even more logic --first the mother's surname, and secondly the father's--, since one usually knows who their mother is, but not always their father.
The women generally haven't been that underestimated in Iberia than in the ultrapyrenean countries, and especially intense after the lutheran schism. The women conserved their rights under the Catholicism.
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