Genetic studies of Sayyids of the Indian sub-continent
The authors of the study, the Y chromosomes of self-identified Syeds from the Indian sub-continent are no less diverse than those non-Syeds from the same regions, suggested that Syed status, rather than being strictly patrilineal, may have been passed through other routes.The paper, "Y chromosomes of self-identified Syeds from the Indian subcontinent", by Elise M. S. Belle, Saima Shah, Tudor Parfitt, and Mark G. Thomas showed that "self-identified Syeds had no less genetic diversity than those non-Syeds from the same regions, suggesting that there is no biological basis to the belief that self-identified Syeds in this part of the world share a recent common ancestry. However, self-identified men belonging to the ‘Islamic honorific lineages’ (Syeds, Hashemites, Quraysh and Ansari) show a greater genetic affinity to Arab populations—despite the geographic distance – than do their neighbouring populations from South Asia.In Northern India, 29 per cent of the Shia Muslim belong to haplogroup J. There are 18 per cent belonging mainly to haplogroup J2 and another 11 per cent belong to haplogroup J1, which both represent Middle Eastern lineages. J1 is exclusively Near Eastern. Southeast Asia
Most of the Alawi Sayyids who moved to Southeast Asia were descendants of Ali ibn Husayn Zayn al-Abidin, especially of Ba Alawi sada, many of which were descendants of migrants from Hadhramaut. Even though they are alleged descendants of Husayn, it is uncommon for the female Sayyids to be called Sayyidah; they are more commonly called Sharifah.
Since most of the population embraced Sunni Islam, and an educated version of Shiism was scarce in Iran at the time, Ismail imported a new group of Shia Ulama who predominantly were Sayyids from traditional Shiite centers of the Arabic-speaking lands, such as Jabal Amel (of southern Lebanon), Syria, Bahrain, and southern Iraq in order to create a state clergy. The Safavids offered them land and money in return for loyalty. These scholars taught Twelver Shiism, made it accessible to the population, and energetically encouraged conversion to Shiism.During the reign of Shah Abbas the Great, the Safavids also imported to Iran more Arab Shias, predominantly Sayyids, built religious institutions for them, including many Madrasas (religious schools), and successfully persuaded them to participate in the government, which they had shunned in the past (following the Hidden imam doctrine).Common Sayyid family surnames in Iran are Husseini, Mousavi, Kazemi, Razavi, Eshtehardian, Tabatabaei, Hashemi, Hassani, Jafari, Emami, Ahmadi, Zaidi, Imamzadeh, Sherazi, Kermani (kirmani), Shahidi, and Mahdavi. Bahrain
In Bahrain Sayyids are used to refer to great grand childrens of the Prophet Muhammed.Sayyids are funded every where and in vast populations although number are contradicted.Sayyids started living in Bahrain since the beging of the 8th century.The Bahrainis spurted, Imam Ali in his wars in the Camel, Siffin and Nahrawan, and several Bahraini men emerged from the leaders of the Commander of the Faithful including the companion Zayd ibn Suhan al-Abdi who was killed in the Battle of the Camel when he was fighting alongside the Commander of Imam Ali.