Name input doesn't support cultural specific names

Description:
Cultural specific symbols such a s/o for Indian names are being rejected by the application. This is regrettable considering how this application is meant for doctors in Singapore and many patients might have this format in their naming.

Steps to Reproduce: Run the following sample command to add someone of name Kumar s/o Suresh

add n/Kumar s/o Suresh p/98765432 e/kumar@example.com i/T1234123A a/John Street, Block 123, #01-01 t/3

Expected Result:
It should successfully add the entry to the result, given that there is no one else with same NRIC.

Actual Result:
The following error message is received:

Names should only contain alphanumeric characters and spaces, and it should not be blank

Suggestion:

Perhaps add the support for s/o and other related symbols to be permitted in the name list.

apollo-tan / pe

Name input doesn't support cultural specific names #2