No — Marcus Williamson is not confirmed to be left-handed. No reliable public source currently confirms his handedness.

Marcus Williamson is an American former college football player who primarily played as a cornerback. He is best known for his tenure with the Ohio State Buckeyes, where he contributed to one of the top programs in NCAA Division I football.

Williamson, a highly-rated recruit out of Westerville, Ohio, committed to Ohio State University, joining the team in 2017. Throughout his collegiate career, he played a role in the Buckeyes' defensive secondary, appearing in various games and contributing on special teams.

During his time at Ohio State, Williamson was part of teams that achieved significant success, including multiple Big Ten Conference championships and appearances in the College Football Playoff. He gained experience playing against some of the best offensive talent in college football.

After his college career, Marcus Williamson entered the NFL Draft. While he was a prospect, information about his professional career beyond college is less widely publicized. He is remembered for his contributions to the Ohio State Buckeyes' football program.