Have you ever met someone whose first name was in one language (presumably their native tongue), but who had a nickname they usually went by that was in another language? I'm not talking about jews in foreign countries who went by 2 sets of names, I'm talking about nicknames that were acquired during the person's lifetime. Personally, in my family, we have these:
Ya'akov, nicknamed
Jacquesanother
Ya'akov, nicknamed Giaco
Yitzhak, nicknamed Zacco (after italian
Isacco)
Liza, nicknamed
Aliza