Parse this person name:

Joseph Stephen W. David Washington, Port Amandafort, flourished 1917-1929
user
first_name: Joseph
last_name: Washington
middle_names:
- Stephen
- W.
- David
temporal:
- start: 1917
  end: 1929
  type: flourished
titles: []
extra_info:
- Port Amandafort
assistant