There are no legal a priori constraints on the choice of names nowadays, but this has not always been the case. The choice of given names, originally limited only by the tradition of naming children after a small number of popular saints, was restricted by law at the end of the 18th century, could be accepted. Much later, actually in 1966, a new law permitted a limited number of mythological, regional or foreign names, substantives (Olive, Violette), diminutives, and alternative spellings. Only in 1993 were French parents given the freedom to name their child without any constraint whatsoever. However, if the birth registrar thinks that the chosen names (alone or in association with the last name) may be detrimental to the child's interests, or to the right of other families to protect their own family name, the registrar may refer the matter to the local prosecutor, who may choose to refer the matter to the local court. The court may then refuse the chosen names. Such refusals are rare and mostly concern given names that may expose the child to mockery. To change a given name, a request can be made before a court (juge des affaires familiales), but except in a few specific cases (such as the Gallicization of a foreign name), it is necessary to prove a legitimate interest for the change (usually that the current name is a cause of mockery or when put together with the surname, it creates a ridiculous word or sentence, e.g.: Jean Bon sounds jambon "ham", or Annick Mamère = A nique ma mère, slang for "she fucks my mother"). Surnames It is believed that the number of surnames in France at any time since 1990 has lingered between 800,000 and 1,200,000. The number of surnames is high proportional to the population; most surnames have many orthographic and dialectal variants (more than 40 for some), which were registered as entirely separate names around 1880 when "family vital records booklets" were issued. According to the Institute of Statistics (INSEE), more than 1,300,000 surnames were registered in the country between 1891 and 1990, and about 200,000 have disappeared (mainly unique orthographic variants). According to different estimates, 50 to 80 percent of French citizens may bear rare family names (fewer than 50 bearers alive at the census time). Not all family names are of French origin, as many families have some immigrant roots. French naming