Sources give two different people for whom Elvis was a shabbos goy. In Tugging at Jewish Weeds: An Interview with Steve Stern it was the Dubrovner family; to Alfred J. Kolatch, in his Inside Judaism: The Concepts, Customs, and Celebrations of the Jewish People (Pub. Jonathan David, 2006), p. 480, citing a secondary source, it is Rabbi Alfred Fruchter who is helped.
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Fertig, Avi. "Glatt Kosher Adventure To The Land Down Under", The Jewish Press, November 21, 2007. "Former Secretary of State Gen. Colin Powell and Mario Cuomo, former governor of New York State, each a former Shabbos goy, both share fond recollections of their youth, when they were uniquely qualified to lend a Jewish neighbor a hand."
Rosen-Zvi, Ishay (June 10, 2016). "What if We Got Rid of the Goy? Rereading Ancient Jewish Distinctions". Journal for the Study of Judaism. 47 (2). Brill: 149–182. doi:10.1163/15700631-12340458. ISSN0047-2212. S2CID163738717.
Chan, Sewell, "White Ethnic Politics: Irish and Italian Catholics and Jews, Oh, My!", The New York Times, October 25, 2007. "'I became the Shabbos goy at the synagogue,' he said. 'So every Saturday morning, I would go in, on my way to Holy Name Church, with my surplice on my arm and I would do whatever the rabbi would ask me to do — turn on the gas stove, whatever — and there would be a dime on the shelf at the front door, which he wouldn't touch, and off I’d go.' Mr. Hamill cited other 'Shabbos goys': Colin L. Powell, Martin Scorsese, even Elvis Presley."
Rosen-Zvi, Ishay (June 10, 2016). "What if We Got Rid of the Goy? Rereading Ancient Jewish Distinctions". Journal for the Study of Judaism. 47 (2). Brill: 149–182. doi:10.1163/15700631-12340458. ISSN0047-2212. S2CID163738717.
Rosen-Zvi, Ishay (June 10, 2016). "What if We Got Rid of the Goy? Rereading Ancient Jewish Distinctions". Journal for the Study of Judaism. 47 (2). Brill: 149–182. doi:10.1163/15700631-12340458. ISSN0047-2212. S2CID163738717.