The Guild of One-Name Studies is a charitable organisation dedicated to promoting the public understanding of one-name studies and the preservation and accessibility of the resultant information. Founded in 1979 in Britain, the Guild has over 2,300 members all over the world, studying around 7,850 surnames. A one-name study is a project researching facts about a surname and all the people who have held it, as opposed to a particular pedigree (the ancestors of one person) or descendancy (the descendants of one person or couple).
Only one person may register a specific surname, but membership of the Guild is open to all with an interest in surname studies, and is not restricted to those who wish to register a name. The Guild brings together those with an interest in one-name studies and other forms of surname study (such as DNA projects).