Guild Wars 2

Hello, Recently my account was blocked because of an inappropriate nickname. My nickname is polish “Syn Ciemnosci” which means “Son of Darkness” in english. I do not see anything wrong with my nickname so please unblock my character

You will need to contact support about it by making a ticket.

Top of this page-support
Top right of the next page-submit a request

Make a ticket and they can fix it or tell you why it was changed.

If you had a name changed (or blocked), it was because another player reported the name as being inappropriate and after reviewing the report ArenaNet agreed. For something like this the forums are not going to be able to provide you any assistance. You should submit a service request and ask the support staff for help. They are the only ones that can offer you the information you are looking for.

It is apparently also the name of a movie. There may be some issue with copyright. But do contact support for further clarification.