To the issue of watermarking and not having a specific name....
you can watermark it
Property of Your Name
DO NOT COPY
or you can put do not copy and make it a little transparent and put property of your name right over it in smaller print
To avoid images precious to you from being stolen, put them in the middle of the photo or over the main subject, if it is in the corner or in a non focused point of the photo, they can be cropped out. Another trick i have seen is to write it several times across the photo in a diagnol or horizontal pattern...