Extract only names using regular expression in Oracle SQL

Hi Team,

I need to write a query to pull out the name from a given column, the column has values like

ID        NAME

1         DR . A Sam 

2          DR . A. Gopal

3        Sam Gopal , DR

4         Daniel Raj . DR .

output : 

1 A Sam

2 A. Gopal

3 Sam Gopal 

4   Daniel Raj

Select regexp_substr(NAME,'([a-zA-Z\.]+])|([^,\.]+)',1,1)

from dual;

Any help is really appreciated.