Parse this person name:

Tracy Q. William Mcmahon, Stephenfurt, flourished 1728-1749
user
first_name: Tracy
last_name: Mcmahon
middle_names:
- Q.
- William
temporal:
- start: 1728
  end: 1749
  type: flourished
titles: []
extra_info:
- Stephenfurt
assistant