What is "ankarcrona"

Ankarcrona is a Swedish noble family originating from Christoffer Jakobsson, a German Protestant convert who immigrated to Sweden from Bohemia in the 17th century, and resided in Ronneby in Sweden. Two of his grandsons were ennobled, but these branches ceased in 1719 and 1750.

The now living branch stems from his third grandson, the assessor Jakob Christoffer in Karlskrona. He was ennobled in 1751.