>...The Spanish Flu was called that because at the time everyone (for xenophobic reasons... sound familiar?)

No, it tended to be called the Spanish Flu because Spanish newspapers simply reported more about the epidemic:

>...Spain was not involved in the war, having remained neutral, and had not imposed wartime censorship.[17][18] Newspapers were therefore free to report the epidemic's effects, such as the grave illness of King Alfonso XIII, and these widely-spread stories created a false impression of Spain as especially hard hit.

Some theorize it might have first originated in Kansas:

>...The first confirmed cases originated in the United States. Historian Alfred W. Crosby stated in 2003 that the flu originated in Kansas,[61] and popular author John M. Barry described a January 1918 outbreak in Haskell County, Kansas, as the point of origin in his 2004 article.

But then again:

>...A 2018 study of tissue slides and medical reports led by evolutionary biology professor Michael Worobey found evidence against the disease originating from Kansas, as those cases were milder and had fewer deaths compared to the infections in New York City in the same period. The study did find evidence through phylogenetic analyses that the virus likely had a North American origin, though it was not conclusive. In addition, the haemagglutinin glycoproteins of the virus suggest that it originated long before 1918, and other studies suggest that the reassortment of the H1N1 virus likely occurred in or around 1915.

Some theorize it might have first originated in Europe:

>...The major UK troop staging and hospital camp in Étaples in France has been theorized by virologist John Oxford as being at the center of the Spanish flu.[63] His study found that in late 1916 the Étaples camp was hit by the onset of a new disease with high mortality that caused symptoms similar to the flu.[64][63] According to Oxford, a similar outbreak occurred in March 1917 at army barracks in Aldershot,[65] and military pathologists later recognized these early outbreaks as the same disease as the Spanish flu.[66][63] The overcrowded camp and hospital at Etaples was an ideal environment for the spread of a respiratory virus.

>...A report published in 2016 in the Journal of the Chinese Medical Association found evidence that the 1918 virus had been circulating in the European armies for months and possibly years before the 1918 pandemic.[67] Political scientist Andrew Price-Smith published data from the Austrian archives suggesting the influenza began in Austria in early 1917.

But then again:

>...A 2009 study in Influenza and Other Respiratory Viruses found that Spanish flu mortality simultaneously peaked within the two-month period of October and November 1918 in all fourteen European countries analyzed, which is inconsistent with the pattern that researchers would expect if the virus had originated somewhere in Europe and then spread outwards.

Some theorize it was China:

>...In 1993, Claude Hannoun, the leading expert on the Spanish flu at the Pasteur Institute, asserted the precursor virus was likely to have come from China and then mutated in the United States near Boston and from there spread to Brest, France, Europe's battlefields, the rest of Europe, and the rest of the world, with Allied soldiers and sailors as the main disseminators.[70] Hannoun considered several alternative hypotheses of origin, such as Spain, Kansas, and Brest, as being possible, but not likely.[70] In 2014, historian Mark Humphries argued that the mobilization of 96,000 Chinese laborers to work behind the British and French lines might have been the source of the pandemic. Humphries, of the Memorial University of Newfoundland in St. John's, based his conclusions on newly unearthed records. He found archival evidence that a respiratory illness that struck northern China (where the laborers came from) in November 1917 was identified a year later by Chinese health officials as identical to the Spanish flu.

On the other hand:

>...A report published in 2016 in the Journal of the Chinese Medical Association found no evidence that the 1918 virus was imported to Europe via Chinese and Southeast Asian soldiers and workers and instead found evidence of its circulation in Europe before the pandemic.

https://en.wikipedia.org/wiki/Spanish_flu

So far the historical and epidemiological data cannot identify the geographic origin of the Spanish flu.