Well, that's not easily possible. You have two options:
Concatenate the fields in the database and search over that. Not really sure how to do this using JPA/Hibernate. It's the fastest method, but you'd need raw SQL for this.
Select all name fields from the database, concatenate them and do the matching in java.
You may have a third option when you can split the input (based on whitespace?) and search each field for all of the input parts, but this gets you into all sorts of problems: what if your user inputs "John Doe" but you have a "Doe, John"? What if someone expects to find a person using her middle name? What if somebody doesn't have a surname?
To sum it up: fetch all name fields from the database, join them and search the list of strings with String#contains()
.