Surname law matronym from the name of a parent or parent-in-law; these possibilities are not necessarily open to native Icelanders. Reza Shah Pahlavi ordered Iranians to adopt Western style surnames in place of old Islamic names and titles during his reign. A law in Japan dating from 1896 requires a married couple to have a common surname. Most commonly it was the wife who took her husband's name. In 2011, this law was challenged as unconstitutional on gender equality grounds, but the Supreme Court of Japan upheld the law in 2015. Prussia tasked the implementation of surnames to E. T. A. Hoffmann.
German name the default case, this is the surname of the groom. The partner who is changing surnames (usually the bride) has the possibility to use their unmarried name alongside the married name with hyphenation. In Switzerland (Art. 160 ZGB), the couple can opt to both retain their unmarried name, or the couple can choose to use either surname as their married name. If both retain their name, they need to declare which will be the surname of any future children. Titles of former aristocrats (like "Graf" for "Count") have become parts of the "Nachname" in Germany, giving longer names of several