Nikhil is a Sanskrit

Sanskrit

Sanskrit , is a historical Indo-Aryan language and the primary liturgical language of Hinduism, Jainism and Buddhism.Buddhism: besides Pali, see Buddhist Hybrid Sanskrit Today, it is listed as one of the 22 scheduled languages of India and is an official language of the state of Uttarakhand...

 word. It is frequently used in Hindi

Hindi

Standard Hindi, or more precisely Modern Standard Hindi, also known as Manak Hindi , High Hindi, Nagari Hindi, and Literary Hindi, is a standardized and sanskritized register of the Hindustani language derived from the Khariboli dialect of Delhi...

, Marathi

Marathi language

Marathi is an Indo-Aryan language spoken by the Marathi people of western and central India. It is the official language of the state of Maharashtra. There are over 68 million fluent speakers worldwide. Marathi has the fourth largest number of native speakers in India and is the fifteenth most...

, Bengali

Bengali language

Bengali or Bangla is an eastern Indo-Aryan language. It is native to the region of eastern South Asia known as Bengal, which comprises present day Bangladesh, the Indian state of West Bengal, and parts of the Indian states of Tripura and Assam. It is written with the Bengali script...

, and other Sanskrit-derived languages. It is a very common name in India

India

India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...

.

Sanskrit fragmentation of the word yields: Ni (without) + Kh (sky or boundary) + L (agreed or liked). It can sometimes refer to "perfection" or "perfectionism".It also means "complete" or "whole".
Also the word "nikhil" came in old ayurved

Ayurveda

Ayurveda or ayurvedic medicine is a system of traditional medicine native to India and a form of alternative medicine. In Sanskrit, words , meaning "longevity", and , meaning "knowledge" or "science". The earliest literature on Indian medical practice appeared during the Vedic period in India,...

 samhita

Samhita

Samhita may refer to"*the basic metrical text of each of the Vedas**specifically, these texts with sandhi applied *post-Vedic texts known as Samhitas:** Ashtavakra Gita...

s like Sushruta Samhita

Sushruta Samhita

The Sushruta Samhita is a Sanskrit text, attributed to one Sushruta, foundational to Ayurvedic medicine , with innovative chapters on surgery....

, where it denotes the meaning "entire".

Notable people named Nikhil

• Nikhil Banerjee
  Nikhil Banerjee
  Nikhil Ranjan Banerjee was a Hindustani classical musician of the Maihar Gharana who played the stringed instrument sitar.-Early life and background:...
  
  , sitar-player
• Nikhil Chopra
  Nikhil Chopra
  Nikhil Chopra is a retired Indian cricketer and a cricket analyst. He was a right-handed batsman and a right-arm offbreak bowler. A One Day International specialist, he was part of the Indian team at the 1999 Cricket World Cup...
  
  , retired cricketer
• Nikhil Dhurandhar
  Nikhil Dhurandhar
  Dr. Nikhil V. Dhurandhar is a university professor who has published details about the adipogenic effect of the human adenovirus AD-36 or Adv36 on laboratory animals , and also its association with human obesity....
  
  , medical researcher
• Nikhil Kanetkar
  Nikhil Kanetkar
  Nikhil Kanetkar is a male Maharashtrian badminton player from Pune India.Kanetkar played badminton at the 2004 Summer Olympics in men's singles, defeating Sergio Llopis of Spain in the first round. In the round of 16, Kanetkar was defeated by Peter Gade of Denmark.Kanetkar became engaged to...
  
  , Olympic badminton player
• Nikhil Nanda
  Nikhil Nanda
  Nikhil Nanda is the Joint Managing Director of Escorts Group, which specializes in agri-machinery, construction & material handling equipment, railway equipment and auto components.-Early life and education:...
  
  , industrialist and son-in-law of Amitabh Bach