Parse this person name:

Arranz, Ruben Berta Jacinta Custodia O. Santiago Berta Jacinta Custodia O. Santiago.
user
first_name: Ruben
last_name: Arranz
middle_names:
- Berta
- Jacinta
- Custodia
- O.
- Santiago
temporal: []
titles: []
extra_info: []
assistant