Surname project

A surname project is a project which uses s to trace male lineage.

Because s are passed down from father to son in many cultures, and s (Y-DNA) are passed from father to son with a predictable rate of mutation, people with the same surname can use ing to determine if they share a within recent history.

When two males share a surname, a test of their Y-chromosome markers will determine either that they are not related, or that they are related. If they are related, the number of markers tested and the number of matches at those markers determines the range of generations until their (MRCA). If the two tests match on 37 markers, there is a 50% probability that the MRCA was less than 5 generations ago and a 90% probability that the MRCA was less than 17 generations ago.

Markers
A Y-DNA test ranges from 10 to 67 markers on the Y chromosome. Most surname projects suggest at least 25 markers. Test results tell how many repeats a given subject has at a particular marker; the variations of repeats are known as s. For example, at, the results will show 8, 9, 10, 11 or 12 repeats. The specific results for a given individual are referred to as a. When a surname project has enough participants, it can determine one or more s for the surname.

Testing companies
Surname projects are now being hosted by companies. Group rates may be obtained for surname projects and some labs even store the submitted samples for a number of years at no cost to the participants. This enables additional tests to be performed as they become available.

Haplogroups
The Y chromosome has been studied intensely and divided into, based upon the results of the number of in certain positions called. These "markers" have been chosen for their demonstrated ability to predict the haplogroup of the tested individual. They are tightly guarded proprietary information. Each testing company used a different set, although many are overlapping. This has allowed such as  and  to convert scores from several companies and find matches within their database for submitted results.

Surname projects with more than 100 participants
Surname projects with more than 100 participants include:
 * the
 * the

General

 * About DNA Surname Projects

Surname project databases

 * Surname DNA Projects Database
 * Cyndi's List - Surname DNA Studies and Projects
 * Ybase surname search
 * Ysearch surname search