List of Famous people who are 31

Ryo Kiyuna is a Japanese karateka. He is a three-time gold medalist in the men's kata event at the World Karate Championships and a two-time gold medalist in the men's team kata event, alongside Arata Kinjo and Takuya Uemura. He is also a four-time gold medalist in both the individual and team kata events at the Asian Karate Championships.

Rahi Jeevan Sarnobat is a female athlete from India who competes in the 25 meters pistol shooting event. She won her first gold medal at the 2008 Commonwealth Youth Games in Pune, India. She is the first woman to win a gold medal in shooting in an Asian Games for India - she won the gold at the 2018 Jakarta Palembang Asian Games in the women's 25 meter pistol event. She had won two gold medals in 2010 Commonwealth Games in New Delhi, the first of the two golds in coming in the 25m pistol pair event with Anisa Sayyed. She had previously won gold in the 25 m pistol event at the 2008 Youth Commonwealth Games which were held in India.

Håvard Nordtveit is a Norwegian professional footballer who plays as a defender or defensive midfielder for Hoffenheim and the Norway national team.

John Collison is an Irish billionaire entrepreneur. He is best known for having co-founded Stripe with his brother, Patrick. The brothers are worth at least $3.2 billion each, after San Francisco-based Stripe raised $150 million from CapitalG, an investment division of Google's parent company Alphabet Inc., and General Catalyst Partners. The brothers hold a controlling interest in Stripe and will be able to retain control should the company go public.

Zachary M. Bogosian is an American professional ice hockey defenceman who is currently a member of the Toronto Maple Leafs of the National Hockey League (NHL). He has previously played for the Atlanta Thrashers, Winnipeg Jets, Buffalo Sabres and Tampa Bay Lightning. Bogosian won the Stanley Cup as a member of the Lightning in 2020.

Toshiki Masuda is a Japanese actor, voice actor and singer previously affiliated with Space Craft Entertainment. He became a freelancer in August 2018. He joined the record label, Toy's Factory in November 2018 as a voice actor and solo singer.

Chen-yi Lee, better known as Leena , is a Japanese fashion model best known for her regular appearances in the CanCam women's fashion magazine.

Kristin Gierisch is a German athlete specialising in the triple jump. She won the silver medal at the 2016 World Indoor Championships, 2018 European Championships and gold at the 2017 European Indoor Championships. She also finished fourth at the 2015 European Indoor Championships and ninth at the 2014 European Championships.

Josh Kline is an American football offensive guard who is currently a free agent. He played college football for Kent State.

Floria Gueï is a French sprint athlete of Ivorian origin. She is best known for her remarkable last leg in the 2014 European Championships 4 × 400 m relay, when she went from fourth to first in the last 50 metres of the race.