Parse this person name:

Peters'Gray, David B. Robin C. X. Cynthia., West Kelly (died 1250)
user
first_name: David
last_name: Peters'Gray
middle_names:
- B.
- Robin
- C.
- X.
- Cynthia
temporal:
- start: null
  end: 1250
  type: life_span
titles: []
extra_info:
- West Kelly
assistant