Is Siri able to recognise a contact nickname and action on it? I want to call my girlfriend using Siri. The problem is that her name is Hungarian and I am not able to pronounce it in a way that Siri recognise it and call her. So I thought that I give her a nickname "girlfriend" and ask Siri to "call my girlfriend". This does not work. Siri asks me who my girlfriend is even though her nickname is defined as "girlfriend"

So what is the easiest way for me to call her using Siri? I have 2,000 names in my contact list with many first names that are the same like her.
In the Contacts app, edit your girlfriend's card to give her a Relationship of girlfriend. This will solve your problem in the most official of ways.

See more detail here.