Here are just a few prominent people who left Islam and converted to
a.. Muslim scholar Hassan Palakkode
b.. Aasish Khan, the son of sarod maestro Ustad Ali Akbar Khan
c.. Nafisa Ali, former Miss India and leading social activist
d.. Nargis Dutt (Fatima Rashid), famous Bollywood actress
e.. Revathi Masoosai, Muslim born Malaysian convert
f.. Haridas Thakura - Prominent Vaishnavite saint born in 1450,
instrumental in the early appearance and spread of Hare Krishna movement. He
used to chat "Hare Krishna" 300,000 times daily! His Muslim name remains
unknown to this day. 
g.. Khushboo Sundar (born Khushboo Khan - Tamil movie actress
h.. Annapurna Devi (born Roshanara Khan) - Surbahar (bass sitar) player
and music teacher in the North Indian classical tradition
i.. Asha Gawli (born Ayesha) - Wife of Arun Gawli, notorious gangster
(dada) turned politician from Mumbai, India.
j.. Aashish Khan (born Ustad Aashish Khan Debsharma) - Indian musician
k.. Ifa Sudewi - Chief judge for the 2002 Bali bombing trials in
l.. Harilal Mohandas Gandhi - He was the son of Mahatma Gandhi (father of
India) and converted to Islam. He was in Islam for a few months, before
reverting back to Hinduism.
m.. Umesh (born Mohammad Umer) - Bhopal born man whose marriage and
conversion to Hinduism was upheld by an Indian High Court
n.. Anjum Hussain alias Bhavani
o.. Bukka I - King of Vijayanagara empire who converted to Islam, then
reconverted. The early life of Bukka as well as his brother Hakka (also
known as Harihara I) are relatively unknown and most accounts of their early
life are based on theories.
p.. Harihara I - King of Vijayanagara empire who converted to Islam, then
q.. Netaji Palkar - Maratha noble and commander-in-chief of the army of
Shivaji, 19 June 1676.
r.. Sarmad - 17th century mystical poet and Sufi saint, arrived from
Persia to India, beheaded for assumed heresy by the Mughal emperor,
Aurungzeb. Sarmad renounced Judaism, briefly converting to Islam and then
Hinduism. He later denounced all religions and rejected belief in
s.. Anwar Shaikh (British Author). 
t.. Zubeida - Hindi film actress, on whose life story the film Zubeidaa
u.. Nalini Patel (born Nayyara Mirza) - Miss India finalist of 1967, was
the first Muslim to participate in the pageant. She converted to Hinduism
after marriage. She is settled in the USA.
v.. Shanti Devi (born Ashgari) - Mother of yesteryear Bollywood Actress
Tabassum. She was daughter of a Maulvi but converted to Hinduism after
marriage and even underwent Hindu religious education.
w.. Nadira Babbar (born Nadira Zaheer) - Wife of actor turned politician
Raj Babbar. She converted to Hinduism upon marriage. She was the daughter of
communist leader Syed Sajjad Zaheer and Urdu writer Razia Sajjad Zaheer.
x.. Sonam (born Bakhtawar Murad) - Bollywood actress and Wife of Bollywood
director Rajiv Rai. She converted to Hinduism upon marriage. She is the
niece of character actor Raza Murad and granddaughter of veteran character
actor Murad. She is the cousin of actress Sanober Kabir