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Re: Last name of a professor
Wow.....that's a doozy. You say she's Cuban? Try asking her again. It may be that her name is a variation on a last name used in a local dialect. That's just a guess.
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Llacuna is a variant of "lago", lake. It comes from names of places
see also Llagunes, Llaguno.

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Am I right in thinking that the initial double L is indicative of a Catalan rather than a Castilian surname?
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yes, normally names that start with a double 'l' are Catalan, but also Catalan and Basque surnames are to be found in Spanish colonies, so this must be one of them.
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