When answering questions about "firsts" in space or other fields, it's crucial to differentiate between nationality, origin, gender, and specific roles (e.g., traveler vs. program founder).
Step 1: Understand the specific criteria in the question.
The question asks for the "first Indian origin traveller to space". This implies a person who is of Indian heritage and was the first among them to travel to space.
Step 2: Evaluate each option based on their historical roles in space travel or the Indian space program. (1) Rakesh Sharma: Wing Commander Rakesh Sharma was the first Indian citizen to travel to space. He flew aboard the Soviet Soyuz T-11 spacecraft as part of the Interkosmos programme in April 1984. This fits the description of the first Indian origin traveller to space.
(2) Kalpana Chawla: Kalpana Chawla was the first woman of Indian origin to go to space. She was an American astronaut and engineer who was part of the Space Shuttle Columbia STS-87 mission in 1997. She traveled to space after Rakesh Sharma.
(3) Sunita Williams: Sunita Williams is an American astronaut of Indian descent. She made her first spaceflight in 2006. She also traveled to space after Rakesh Sharma.
(4) Vikram Sarabai: Vikram Sarabhai is widely regarded as the Father of the Indian Space Program. He was a scientist and innovator, but he was not an astronaut or a space traveler.
Step 3: Conclude the correct individual.
Based on historical records, Rakesh Sharma was the first person of Indian origin to travel to space.