Hair-Style-Hindu traditional way
Though traditionally all Hindus were required to wear a śikhā, today it is seen mainly among Brahmachari, ‘celibate monks’ and temple priests
The śikhā is tied back or knotted to perform religious rites. Only funerals and death anniversaries are performed with the śikhā untied or with dishevelled hair. Dishevelled hair is considered inauspicious, and represents times of great sorrow or calamity.
In his autobiography, Mohandas K. Gandhi ( Popularly known as Mahatma Gandhi,Indians proudly describe him as Father of the Nation) writes about his encounter with an orthodox Hindu:
He was pained to miss the shikha (tuft of hair) on my head and the sacred thread about my neck and said: ‘It pains me to see you, a believing Hindu, going without a sacred thread and the shikha. These are the two external symbols of Hinduism and every Hindu ought to wear them.’ … [T]he shikha was considered obligatory by elders. On the eve of my going to England, however, I got rid of the shikha, lest when I was bareheaded it should expose me to ridicule and make me look, as I then thought, a barbarian in the eyes of the Englishmen. In fact this cowardly feeling carried me so far that in South Africa I got my cousin Chhaganlal Gandhi, who was religiously wearing the shikha, to do away with it. I feared that it might come in the way of his public work and so, even at the risk of paining him, I made him get rid of it.
The śikhā was one of the few symbols of Hindus that transcended caste, language or regional barriers. Although there were variations of the style of sikha amongst communities, it was obligatory for all males.
Information Courtesy- WIKIPEDIA
I have seen similar but slightly different hairstyles ,Chinese having in some of the Chinese Movies.
In India I have come across Westerners who are followers of ‘ ISKCON’ ( International Society For Krishna Consciousness),having ‘tuft of hair’