Those who limit the term Sayyid to descendants of Muhammad through Fatima, Allawis/Alavis are the same how Sayyids. Some Sayyids are Najeeb Al Tarfayn, meaning "Noble on both sides", which indicates that both of their parents are Sayyid. Existence of descendants of Hasan al-Askari
The existence of any descendant of Hasan al Askari is disputed by many people. Some genealogies of Middle Eastern and Central Asian families (mostly from Persia), East Africa (mostly in Somalia and Ethiopia), Khorasan, Samarqand, and Bukhara show that Hasan al-Askari had a second son called Sayyid Ali Akbar, which indicates that al-Askari had children and substantiates the existence of Muhammad al Mahdi. Whether in fact al-Askari did have children is still disputed, perhaps because of the political conflicts between the followers of the Imamah and the leadership of the Abbasids and Ghulat Shiites who do not believe in Hasan al-Askaris Imamah. Another group of historians studying the pedigrees of some Central Asian saints shejere (genealogy trees) believe that the Twelfth Imam was not the only son of Hasan al-Askari, and that the Eleventh Imam had two sons: Sayyid Muhammad (i.e., the Shia Mahdi) and Sayyid Ali Akbar. According to the earliest reports as from official family tree documents and records , Imam Hasan al-Askari fathered seven children and was survived by six. The names of his biological children were: Imam Muhammad al-Mahdi, Musa, Ja’far, Ibrahim, Fatima, Ayesha, and ‘Ali, sometimes referred to as Akbar, Asghar or Abdullah.Sayyid ‘Ali Akbar bin Imam Hasan al-Askari is Sultan Saadat (Sodot) who died in Termez.
Several visited India as merchants or escaped from the Abbasid, Umayyad and Safavid. Their names appear in Indian history at the dissolution of the Mughal Empire, when the Sayyid brothers created and dethroned emperors at their will (1714–1720). The first Muslims appointed to the Council of India and the first appointed to the privy council were both Sayyids. Afghanistan
In Afghanistan, Sayyids (Sadat) are recognized as an ethnic group. On 13 March 2019, addressing the Sadat gathering at the presidential palace (Arg), President Ashraf Ghani said that he will issue a decree on the inclusion of Sadat ethnic group in new electronic national identity card (e-NIC).President Ashraf Ghani decreed mentioning Sadat tribe in the electronic national identity on 15 March 2019.Sayyids of the north are generally located in Balkh and Kunduz; while in the east they can be found in Nangarhar. While most are Sunni Muslims, some in the Bamiyan province are to Shia. India
The total Sayyid population in India is 7,017,000, with the largest populations in Uttar Pradesh (1,493,000), Maharashtra (1,108,000), Karnataka (766,000), Andhra Pradesh (727,000), Rajasthan (497,000), Bihar (419,000), West Bengal (372,000), Madhya Pradesh (307,000), Gujarat (245,000), Tamil Nadu (206,000), and 25,000 in Jammu and Kashmir. Sayyids are also found in the north-eastern state of Assam, where they are locally also referred to as Dawans.In India, Sayyids of Hadramawt (who originated mainly from the Arabian Peninsula and the Persian Gulf) gained widespread fame.