Medieval names took many forms.
Human names tend to use combinations of the following:
- first (or Christian) names
- e.g. Ingrid, Michael, Giovanni, Ivan, Catherine, Tomas
- In early period, Christians tended to take names from the New Testament or saints. Names from the Old Testament (Abraham, Isaac, Moses) were considered the province of Jews, although there were of course exceptions. There are occasional instances of girls being given the names of flowers or precious stones (e.g. Rose, Emerald) but these are unusual until very late in period when the influence of classical literature by way of the Renaissance even occasionally resulted in use of a pagan deity name (e.g. Diane de Poitiers).
- e.g John of London (English), Jhonne Glasgow (Scottish), Jehan de Paris (French), Gunther von Augsberg (German), Juan de Burgos (Spanish)
- Also, with a more localised flavour someone could be surnamed Bridge, Mill, Shore or Hermitage because they lived "close by the" whatever.
- Patronymic/Matronymic (citing your father or mother)
- e.g. Thorvaldr Thorgeirsson (Norse), Bernardo di Vincenzo (Italian), Boris Ivanovich (Russian), Ifor ap Dafydd (Cymraeg/Welsh), Sean U Neill (Irish), John FitzGilbert (Norman--often, but not always (see below) an indicator of illegitimacy)
- Depending on the culture, women would use differentiating terminology to indicate "daughter of":
- e.g. Sigrid Njalsdatter (Norse), Ceinwen ferch Llewellyn (Cymraeg/Welsh), Aine inghean Sheain (Irish), Natasha Ivanova (Russian)
- One of the best-known examples of a matronymic is that of King Henry II of England, who was also known as Henry FitzEmpress (his mother was the widow of the Holy Roman Emperor and continued to use the title Empress even after she'd married his father, Count Geoffrey of Anjou. Henry was not illegitimate!).
- To further confound naming practices, Henry adopted his father's nickname, Plantagenet (due to his habit of wearing a sprig of Planta Genesta (common broom) in his hat) as the name of his dynasty.
- Clan or family affilation
- e.g. O'Brien, MacNaughton, di Medici
- e.g. John Longshanks, Eric the Red, Vlad Dracule
- Occupational names
- e.g. Thomas Wheeler, John Cooper, Edward Carpenter, William Chandler
Which specific names and types of bynames are appropriate for you depends entirely on what you are trying to re-create. The most important factors are the time, place, and culture you want to re-create, but your gender and class are important, too. Not all types of surname were used in all cultures -- many early medieval cultures used no surnames at all. Modern naming customs are generally not a good guide to medieval naming customs. For example, the Spanish custom of multiple given names and compound surnames refering to your mother and father did not come into general use until well after our period.
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Your SCA persona will have an SCA name that should be registered with your herald and the SCA College of Arms. Although there is no requirement that you register your name, doing so guarantees that no one else in the SCA can (legally) use it. It is far more important that you choose a name that is a good re-creation of the naming customs of some medieval culture. You can find reliable information to help you do that at the Academy of Saint Gabriel and particular in its Medieval Names Archive. Be careful using other web resources: Almost none of them are intended as sources for accurate historical re-creation, and so the names you find there will generally not be correct.
Your branch will have to register a name as well. Some types of branches often follow particular fashions in naming, e.g. some colleges are often named after a patron saint. This follows one of the historical models for naming colleges in medieval Europe.