from there, there has long been a tradition for a woman to change her surname upon marriage from her birth name to her husband's family name. (See Maiden and married names.) In the Middle Ages, when a man from a lower-status family married an only daughter from a higher-status family, he would often adopt the wife's family name. In the 18th and 19th centuries in Britain, bequests were sometimes made contingent upon a man's changing (or hyphenating) his family name, so that the name of the testator continued. The United States followed the naming customs and practices of English common law and traditions until recent times. The first known instance in the United States of a woman insisting on the use of her birth name was that of Lucy Stone in 1855, and there has been a general increase in the rate of women using their birth name. Beginning in the latter half of the 20th century, traditional naming practices (writes one commentator) were recognized as "com[ing] into conflict with current sensitivities about children's and women's rights". Those changes accelerated a shift away from the interests of the parents to a focus on the best interests of the child. The law in this area continues to evolve today mainly in the context of paternity and custody actions. Naming conventions in the US have gone through periods of flux, however, and the 1990s saw a decline in the percentage of name retention among women. As of 2006, more than 80% of American women adopted the husband's family name after marriage. It is rare but not unknown for an English-speaking man to take his wife's family name, whether for personal reasons or as a matter of tradition (such as among matrilineal Canadian aboriginal groups, such as the Haida and Gitxsan). Upon marriage to a woman, men in the United States can change their surnames to that of their wives, or adopt a combination of both names with the federal government, through the Social Security Administration. Men may face difficulty doing so on the state level in some states. It is exceedingly rare but does occur in the United States, where a married couple may choose an entirely new last name by going through a legal change of name. As an alternative, both spouses may adopt a double-barrelled name. For instance, when John Smith and Mary Jones marry each other, they may become