The (UK) National Archives have made available on their Documents Online pay per view service about 40,000 World War One service records belonging to those who served in the Royal Naval Volunteer Reserve. You can conduct a free search.
The service records of RNVR ratings contain details such as name, division and service number, date of birth, former occupation, whether formerly in the Royal Navy or Royal Marines, a physical description, date and period of engagements, ships or units served in, period of service, and remarks about character and ability. Very occasionally a record may reveal the place of birth.
Find an explanation of the record set here.