Guys,

I am doing a research, can someone tell me what is the difference between a Jaisi bahun and kumai bahun. 
Can you also please give me some surnames as an example. This is totally for educational purpose so racist ppl stay away. 

jaisis are atually joshis and not differernt to others. but pn shah banned them from doing their job as jyotish since they once conspired with valley king and tried to kidnap his eldest son while hunting.
from then onwards ,jaisi bahuns were degraded from others and not allowed to perform rituals like public pujas and astrology works.
otherwise ,the upadhayas consider themselve pure since they didnt mix with khas race when they came northwards to hinduise the khas. the ones who took hinduism easily or married upadhyas became khas bahuns(both purbiya and jaisis).and the pure khas who accepted the thread became chetris while the ones who resisted became the matwali khas and dalits.

The Dharmasutras and Dharmasatras text of Hinduism describe the expectations, duties and role of Brahmins. The rules and duties in these Dharma texts of Hinduism, states Patrick Olivelle, are primarily directed at Brahmins.^[14][15] The Gautama's Dharmasutra, the oldest of surviving Hindu Dharmasutras, for example, states in verse 9.54-9.55 that a Brahmin should not participate or perform a ritual unless he is invited to do so, but he may attend. Gautama outlines the following rules of conduct for a Brahmin, in Chapters 8 and 9:^[16][17]

• Be always truthful
• Conduct himself as an Aryan
• Teach his art only to virtuous men
• Follow rules of ritual purification
• Study Vedas with delight
• Never hurt any living creature
• Be gentle but steadfast
• Have self-control
• Be kind, liberal towards everyone

Up + adhyaya = Updhyaaya , those got to the highest study. Later they started they were the purest as well highest in the rank.
I am pretty sure in Hindkush these learned people were the must racist as well must cruel people and they are still practicing it. There must be some reasons behind it.
Purity was not Hitlar's theory it is borrowed from Hindkush's learned people who kept education as their rights and assets. . There is no cast in any Veds but Varna .
They wrote another book DharmaSastra : and divide people by work.

magorkhe1,
You said "Hindukush's learned people who kept education as their rights and assets." which is factually incorrect which today is a common interpretation of the actions of the people who lived more than 3000 years ago.

However there does exist There could have been various motives. One of them is that at that time there was not a social mobility as it is today. There were rulers, Learned (philosophical), business(traders who brought goods from one place to another or manual manufacturing) and service people(who were laborers carrying goods and other services). It was not like today that a person can do various jobs and make decent living. The job market since around 17th century has really exploded and we are thinking on these terms. We know that Newars in Kathmandu kept their art of making some items a family secret much like the patent in today's world. This was a protection in a society where mechanism of intellectual property protection was not available.

It is NOT a fact that learned people(Brahmins) kept education as their rights and assets. Sage Vyasa, the original author of the Mahabharata, was born to a fisherwoman. Rishi Valmiki the original composer of Ramayana came from a tribal family of traditional hunters and there are many other examples from the historical books.

In today's society it is foolish to give much credence to the cast system because of huge societal changes that have happened in the thousands of years. Specially in the 21st century the cast system has lost its relevance. Today because of mobility enabled by modern technology people have much better grasp of the ideas of humanity and besides you would rather marry an educated person who is equal to you than another who cares least about it .

In the end I have to say Hindu Dharma is simply great. It enables an individual to actually reach the ultimate not like the Christian and Muslim religion which simply cares if people are following books written thousands of years ago to the dot.

Your parent moved to big city and no body knows who belongs to which cast. In hilly area discrimination is there and it is more severe in Tarai were new Indian immigrants are in larger numbers. They are not even allowing ri untouchable to touch their tubell and well for drinking water. Just get drinking water they may be paying something for it.
You may have heard but not seen.