I don't know where this name comes from originally, but it is never used as a pet form for Ana in Romania from my experience. I know many girls named Anca, it must have been very common in Romania especially in the 1990s, and it was always their full name.Anca is not a nickname for Ancuța. Romanian nicknames for girls often end in -uța. Therefore Ancuța is a very informal nickname for a girl named Anca, not the other way around. Ancuța is a common informal nickname for Anca.Ancuța is rarely used on its own. It would be highly unusual for a girl with the full name of Ancuța to be called Anca. It's the equivalent to someone legally named Jessie being called Jessica as a nickname.
― Anonymous User 8/8/2018
5
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Anca is not a nickname for Ancuța. Romanian nicknames for girls often end in -uța. Therefore Ancuța is a very informal nickname for a girl named Anca, not the other way around. Ancuța is a common informal nickname for Anca.
Ancuța is rarely used on its own. It would be highly unusual for a girl with the full name of Ancuța to be called Anca. It's the equivalent to someone legally named Jessie being called Jessica as a nickname.