Parse this person name:

Dr. Stéphane Royer, Diaz-sur-Blanc, 1621-1649
user
first_name: Stéphane
last_name: Royer
middle_names: []
temporal:
- start: 1621
  end: 1649
  type: life_span
titles:
- Dr.
extra_info:
- Diaz-sur-Blanc
assistant