spring mvc special characters - regex

Question

I'm trying to add a field with special characters like "Patrícia" or "José" and since that field is a Name I used a regex pattern from
^[a-zA-Z\u00C0-\u00FF]+
tested in https://regexr.com/
This is the field inside the user model:
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "user_id")
private Integer id;
(etc)
#Column(name = "name")
#Pattern(regexp = " ^[a-zA-Z\u00C0-\u00FF]+" , message = "{user.name.pattern}")
#NotEmpty(message = "{user.name.empty}")
#Size(min=1, max=40, message = " {user.name.size}")
private String name;
(getters/setters/constructor)
If I add Patricia or Jose, for example the validation succeeds and the user gets inserted. The regex seems ok in the regExr using those names...
This is the error I get:
Hibernate: insert into user (f1, f2, f3, last_name, name, f6, f7, user_id) values (?, ?, ?, ?, ?, ?, ?, ?)
2018-05-22 17:40:34.622 WARN 8475 --- [nio-8080-exec-3] o.h.engine.jdbc.spi.SqlExceptionHelper : SQL Error: 1062, SQLState: 23000
2018-05-22 17:40:34.623 ERROR 8475 --- [nio-8080-exec-3] o.h.engine.jdbc.spi.SqlExceptionHelper : Duplicate entry '3' for key 'PRIMARY'
2018-05-22 17:40:34.624 INFO 8475 --- [nio-8080-exec-3] o.h.e.j.b.internal.AbstractBatchImpl : HHH000010: On release of batch it still contained JDBC statements
2018-05-22 17:40:34.626 ERROR 8475 --- [nio-8080-exec-3] o.h.i.ExceptionMapperStandardImpl : HHH000346: Error during managed flush [org.hibernate.exception.ConstraintViolationException: could not execute statement]
2018-05-22 17:40:34.664 ERROR 8475 --- [nio-8080-exec-3] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.dao.DataIntegrityViolationException: could not execute statement; SQL [n/a]; constraint [PRIMARY]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement] with root cause
com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry '3' for key 'PRIMARY'
What does the primary key has to do with the name validation?
What can I be doing wrong?
Thank you,
Eunito.