Likely a modern short form or variant of Terrell.
Trell is a rare contemporary name, often used as a diminutive of Terrell or Cantrell. While its exact etymology is debated, it is frequently associated with the Germanic roots meaning 'stubborn' or the French 'to draw.' It has gained some visibility in modern American naming through sports and pop culture.
Less common today
Trell isn't in the latest US Top 1000. It last peaked at #7,164 in 1992.
American Olympic sprinter
A character in the Malazan Book of the Fallen series Β· Malazan Book of the Fallen
US births per 5-year period, 1990βpresent (SSA data).