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.
Common-law marriage in the United States that a couple must cohabitate to meet this requirement. As such, an informal marriage can occur under Texas law if the couple lives together for as little as one day, if the other requirements (an agreement to be married and holding out as married to the public) can be shown. Likewise, a couple can cohabit for 50 years, but if they never have an agreement to be married, or hold themselves out to the public as married, their 50-year cohabitation will not make them informally married under Texas law. Dissolution of this type marriage requires formal Annulment or Divorce Proceedings,