The longest known personal name belongs to Hubert Blaine Wolfeschlegelsteinhausenbergerdorff Sr., though its validity is debated.
While "longest name" contests have been held and various sources list exceptionally long names, it's important to distinguish between names officially recognized by a legal entity and names created for the sake of being long. Many of the extremely long names that circulate are considered novelty items or pseudonyms rather than legitimate legal names.
Here's a breakdown of notable examples:
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Hubert Blaine Wolfeschlegelsteinhausenbergerdorff Sr.: This is perhaps the most widely cited example. His name supposedly contained over 700 letters. There are some variations reported to be longer. He appears in the Guinness Book of World Records. However, even its authenticity has been debated.
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Names with a long string of titles/honorifics: Some individuals, particularly in royal families, have lengthy names because they include a substantial number of titles and honorifics. These are less often cited as "longest names," as the core name itself might not be exceptionally long.
It's also worth noting that the concept of what constitutes a "name" varies across cultures and legal jurisdictions.
In summary, while there are claims of incredibly long names, the most famous (and questionably valid) example remains Hubert Blaine Wolfeschlegelsteinhausenbergerdorff Sr.