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http://americanpomeroys.blogspot.com/2013/02/roy-jobbins-pomeroy-oscar-winner-and.html  This seems to indicate that Pomeroy was originally a middle name & Roy's stepfather was named James Bernard Scale.   

However, I found a passenger list for Roy from 1908 that lists his mother as Mrs. J. Pomeroy, 50 Grove End Rd., London. 

I am the author of this article. I work for the American Pomeroy Historic Genealogical Association. My co-researcher and I have put together a large file on Roy. There is a part two to this story which will be posted soon. It explains much more about Roy and why they used the name "Pomeroy". His Mother, Jeannette Shepard Hauser, was not married to a Pomeroy. Pomeroy was a family name that she used to start a business. She was known as "Mrs. Pomeroy" for her business, perhaps because she liked the sound of the name. She was also proud of her lineage-she was a descendent of General Seth Pomeroy, the American Revolutionary War hero. Amos Pomeroy Jobbins, her son with William Henry Jobbins, later went by Roy Pomeroy. His father died when he was very young, and he perhaps felt little connection to the name Jobbins, nor did he feel a connection to the name Scale, which was the last name of his step-father, to whom his mother was only married for a short time. There is more background on all of this in the article!