In Jurassic World, the surname of brothers Gray and Zach is Mitchell.
Gray Mitchell and Zach Mitchell are the two brothers who visit Jurassic World, where their aunt Claire Dearing works as the park’s operations manager. Their visit becomes dangerous after the genetically engineered Indominus rex escapes containment and the park’s systems begin to fail.
The brothers have different personalities and interests. Gray is younger and highly knowledgeable about dinosaurs, while Zach is an older teenager who is initially more focused on his personal life and social concerns. Their relationship develops as they try to survive the crisis together.
The Mitchell brothers are related to Claire through their mother, Karen. The film uses their family visit to connect the park’s large-scale disaster with a more personal story about siblings and their aunt. Their surname is sometimes confused with Dearing, which belongs to Claire, or Lockwood, a separate family associated with later franchise events.