Hi Katia Very curious. Internet is a very good tool¡¡. I live in Madrid, but,my Elizalde comes from Elizondo Valley, concretely from Ciga, 2 km far away from Elizondo. Some old papers copies that I have, shows that Elizalde (one of them) migrated to the South of Spain, etc, etc.
I don´t know if you understand spanish, because that papers are in spanish, and I can scann them and send to you.
You said that you live in Normandia, very beutiful place. I went there 3 years ago. My sister in love was living there, near from Rouen, in a very small village called (St.....du Tille. 15 km far away from Elbeuf)