Most online genealogical resources have nothing at all (much less a geographical source for) the surname, "Darancette"...
Good luck researching your family's early history, FRiend! (No sarcasm intended...)
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(FWIW, my wife's a genealogist -- and I guess I've picked a bit of her interest in the subject...)
The surname Darancette came about on 3/10/1340 when the French Lord of Aquitane made Guiche residents take the name of the house (clan) to which they belonged. The house Arancette still exists in Guiche France. The Spanish variant is Arantzeta.