Helena Romanelli
Helena Romanelli( born September 1, 1987) is a judoka from Brazil.
Daisuke Takahashi (mathematician)
Daisuke Takahashi is a full professor of computer science at the University of Tsukuba, specializing in high- performance numerical computing.
Hugo Pessanha
Hugo Pessanha( born April 1, 1986) is a judoka from Brazil.
Ivaylo Ivanov
Ivaylo Ivanov( born 8 December 1974) is a former Bulgarian football goalkeeper, who works as goalkeeper coach for Litex Lovech.
Ruslan Mirzaliyev
Ruslan Mirzaliyev( born 22 July 1977) is a judoka from Ukraine.
Ivaylo Ivanov (judoka)
Ivaylo Ivanov( born 20 July 1994, Montana, Bulgaria) is a Bulgarian judoka who represented Bulgaria at the 2016 Summer Olympics in Rio de Janeiro, in the Men's- 81 kg.
Yaritza Abel
Yaritza Abel( born August 26, 1983) is a judoka from Cuba.
Frank de Wit
Frank de Wit( born February 13, 1996) is a Dutch judoka.
He competed at the 2016 Summer Olympics in the men's 81 kg event, in which he was eliminated by Ivaylo Ivanov in the second round.
Ann Simons
Ann Simons( born 5 August 1980) is a judoka from Belgium.
Daisuke Takahashi
Takahashi represented Japan at the 2006 Winter Olympics, 2010 Winter Olympics, and 2014 Winter Olympics.
His bronze medal at the 2010 Winter Olympics was the first Olympic medal for Japan in the men's singles event.
He was also the first Asian man to win a World title at the 2010 World Championships.
At the 2012–13 Grand Prix Final, Takahashi made history again as the first Japanese man to win a gold medal in the event, an addition to his previous accomplishment of being the first Japanese man to medal at the event in 2005.
On July 1, 2018 Takahashi announced his return to competitive skating after previously having retired on October 14, 2014.
After two seasons competing domestically in Japan, Takahashi announced that he would begin a career in ice dance partnered with Kana Muramoto beginning in the 2020 – 21 season.

Question: Are both Daisuke Takahashi and Ivaylo Ivanov (Judoka) from the same country?
Answer: no