Title: Samuel W Hill
Content:  Samuel W Hill's propensity for profanity was legendary. Whenever his friends and neighbors would retell his colorful tales, they would substitute "Sam Hill" for the cuss words. Eventually, the phrase "What in Sam Hill?" spread beyond the Keweenaw Peninsula to become part of the American language.
Title: Sam Hill (euphemism)
Content:  Sam Hill is an American English slang phrase, a euphemism or minced oath for "the devil" or "hell" personified (as in, "What in the Sam Hill is that?"). Etymologist Michael Quinion and others date the expression back to the late 1830s;  they and others consider the expression to have been a simple bowdlerization, with, according to the Oxford English Dictionary, an unknown origin.
Title: Sam Hill (euphemism)
Content:  of his early adventures, his ubiquitous use of lurid cuss words became legendary. Whenever friends or neighbors retold his colorful tales in more polite society, they had to tame his unmentionables by substituting the sinless sounding words 'Sam Hill'. In time the expression, 'What the Sam Hill' spread far beyond the Copper Country. Today it has become a part of the American language. Few who utter these words ever heard of Samuel Hill, or know that he was the unconscious originator of a sinless synonym for profanity." Adjutant General in Kentucky: Another possibility involves the former adjutant general of Kentucky Samuel Ewing Hill, who was sent by the governor of Kentucky to 
Title: Sam Hill (euphemism)
Content: Euphemism for the devil: H. L. Mencken suggested that the phrase derives from Samiel, the name of the Devil in Der Freischütz, an opera by Carl Maria von Weber that was performed in New York City in 1825. The phrase "Sa' m Hill" can also be seen in the variant "Samil". ; Store owner in Arizona: Sam Hill was also a mercantile store owner who offered a vast and diverse inventory of goods. People began using the term "what in the Sam Hill is that?" to describe something they found odd or unusual, just like the inventory found in Sam Hill's store. The original Sam Hill Mercantile building still stands on Montezuma 
Title: Sam Hill (rugby union)
Content:  Hill attended Cheriton Bishop Primary School before moving on to Queen Elizabeths Community College in Crediton. Having played for Crediton RFC until the age of 15, Sam gained selection for England under 16s and moved to Ivybridge College sixth form for two years. Hill spent the early years of his professional career dual-registered with Cornish Pirates to aid his player development. Hill has been a regular for England juniors going back to his try scoring debut against the Namibia invitational XV. Hill has also recently been selected to play for England Saxons gaining one cap prompting a call up to England's pre-tour training squad to New Zealand. On 13 March 2020, Hill left Exeter Chiefs to join Premiership rivals Sale Sharks on a two-year deal from the 2020–21 season.
Title: Samuel Hill
Content:  Sam Hill was born into a Quaker family in Deep River, North Carolina. His family was displaced by the American Civil War and Sam grew up after the war in Minneapolis, Minnesota. Hill graduated from Haverford College in 1878 (also his father's alma mater ). At Haverford he studied Latin, Greek, French, and German as well as mathematics, science, English literature, logic, rhetoric, and political science. He attended Harvard University for a year to receive a second bachelor's degree in 1879. At Harvard he continued his Latin and history ("Colonial History of America" under Henry Cabot Lodge) and studied forensics and philosophy ("German Philosophy of the Present Day" and "Advanced Political Economy"). Despite attending only one year, he became an extremely active Harvard alumnus, serving for several years on the Harvard Board of Overseers even though it required many transcontinental trips each year to attend meetings. He also joined (and, at times, led) Harvard Clubs in several cities in the U.S.
Title: Samuel Hill
Content:   Samuel Hill (13 May 1857 &ndash; 26 February 1931), usually known as Sam Hill, was an American businessman, lawyer, railroad executive, and advocate of good roads. He substantially influenced the Pacific Northwest region's economic development in the early 20th century. His projects include the Peace Arch, a monument to 100 years of peace between the United States and Canada, on the border between Blaine, Washington, and Surrey, British Columbia, and the Maryhill Museum of Art. Although his promotion of paved modern roads is possibly his greatest legacy, he is now best remembered for building the Stonehenge replica in Maryhill, Washington.
Title: Samuel Hill
Content:  possible early symptoms of Sam's manic tendencies. In any event, the break was not a sharp one: The two men continued a friendly correspondence in business matters. After a 1901 journey across Russia on the then not-quite-completed Trans-Siberian Railway, Hill settled in 1902 in Seattle, Washington, where he had major interests in the Seattle Gas and Electric Company, which was focused mainly in the coal gas business. Hill had announced his intention to settle in Seattle in December 1900, but his wife Mary did not take well to the Northwest and moved back to Minneapolis after six months in Seattle, with their two children and without Sam. He stayed in Seattle and embarked on a number of ventures in the Pacific Northwest.
Title: Samuel Hill
Content:  In 1931 Hill went to Salem to speak to the Oregon State Legislature regarding the need to regulate trucks, in order to protect the condition of highways; he intended to follow this with a similar address to the Washington State Legislature. He became acutely ill on the way and died from natural causes aged 74 years. The recorded cause of death is "an abscess of the lesser peritoneal cavity which had ruptured into the stomach, producing fatal / terminal hemorrhages." Hill chose a ledge below his Stonehenge replica for his burial site, and designed his own monument. His original monument did not last, and has since been replaced.
Title: Samuel Hill
Content:  Starting in 1907, Sam Hill bought up most of what had been a small settlement called "Columbia" or "Columbus" near the Columbia River in Klickitat County, Washington, which he envisioned as a new community in the Inland Empire. He named the parcel Maryhill, after his wife and his daughter Mary &ndash; neither of whom ever actually lived there. His original plan was to develop it as a farming community of Quakers, but Sam was the only known Quaker resident. Taken as a whole, his attempt to create the Maryhill community was one of Hill's least successful investments: He spent at least US$600,000 that never paid back in any significant measure.

Question: where does what in the sam hill come from?
Answer: simple bowdlerization.