David Lytton's body was discovered at Dove Stone Reservoir in Greater Manchester on 12 December 2015.
He was born David Lautenberg on 21 April 1948 but his name changes to Lytton on the electoral register in 1987.
The 67-year-old flew into London Heathrow from Lahore, Pakistan, two days before his body was found.
He was identified from photos from a passenger list and picked up on CCTV in London.
Greater Manchester Police (GMP) said his identity was confirmed as a result of a DNA match with a relative.
The electoral register examined by BBC Newsnight showed David Lautenberg was listed as living at 46 Lilian Road, London, SW16 5HN from 1982 to 1986, while David Lytton was listed there from 1987 onwards.
It is understood he changed his name due to a family feud, the Guardian reported.
Mr Lytton, who had lived in Pakistan for 10 years, was found fully clothed, lying prone on the ground above the reservoir.
He had no wallet, phone or other identification and remained unidentified despite numerous public appeals and the release of CCTV footage of his last known movements.
In June 2016, the BBC investigated the mystery of the unidentified body.
Why did this man travel 200 miles to die on Saddleworth Moor?
Police said a "provisional" cause of death had been determined as "strychnine poisoning". Police believe he took his own life.
An international police investigation was launched after a post-mortem examination revealed he had a type of titanium plate in his leg which was only manufactured and fitted in Pakistan.
Greater Manchester Police and the National Crime Agency contacted the medical community and the British Embassy in Pakistan to appeal for information.
DNA analysis confirmed that he was David Lytton from London, who had "no obvious connection" to Saddleworth.
Mystery still surrounds the case and why he chose to head to Greater Manchester after returning from Pakistan.
A full inquest is due to take place on 14 March.

The Marine Conservation Society said plastic was a major feature as 16% more litter was picked up than in 2015.
It wants people to pay up to 10p extra when they buy a drink and they will get it back when they return the bottle.
It also wants takeaway containers to be compostable but opponents said the plans would not work.
"With a deposit return scheme, you pay a deposit on a bottle - equivalent to 5p or 10p - and you get it back when you return to a reverse vending machine in a shop," said Gill Bell, Wales conservation manager for the Marine Conservation Society (MCS).
"It's up to you to return the bottle so you would get your deposit back."
"A deposit return scheme [DRS] would work in Wales and we would like the Welsh Government to look at it."
Ms Bell highlighted the success of the 5p levy on plastic carrier bags and said DRS has been successful in other countries such as Germany along with parts of United States and Australia.
Scotland is examining whether to introduce DRS.
However, Jane Bickerstaffe, director of the the Industry Council for Research on Packaging and the Environment is against the move.
She said: "A deposit is a tax in effect.
"You'd have to have a system in place in shops which costs money to run and repair, leaving unintended consequences for the consumer.
"They are financially expensive ways to address just a small part of the problem."
The Welsh Government has been asked to comment.
Other measures MCS wants to see is takeaway containers to be compostable and people to choose more carefully what they are buying in shops when it comes to packaging.
Ms Bell added: "It's about empowering people to do their little bit at home. They can reduce the amount of plastic and packaging they buy."
But Ms Bickerstaffe has a different approach.
"Sometimes the criticism is litter because a few people can't be bothered to put the packaging in a bin so it ends up in the street," she added.
"Litter is a growing problem and one that all of us need to tackle. That's why INCPEN is supporting a new approach called Neat Streets.
"It aims to make everyone proud of their environment so they don't litter anything - till receipts, cups, crisp bags, fishing nets, newspapers, gum, cigarette ends or anything else.
"Unless a place is properly cleaned, it just gets dirty again because even one piece of litter makes people think it's OK to add more."
A mystery man who was found dead on Saddleworth Moor had previously changed his name.
[NEXT_CONCEPT]
The amount of litter on Welsh beaches has risen prompting calls for a deposit scheme to be introduced on bottles, cans and cartons.