The comical pronunciation is only comical when Our-/Ur- as a prefix resembles a relevant word in your language. The second part of the joke comes from the greek spelling/pronunciation which is also not used by all countries/languages referring to the same planet.
Uranus was discovered by British-Hanoverian William Herschel [1] and named after the Greek god of the sky, Οὐρανός [2], which anglifies to Ouranos.
[1] https://en.wikipedia.org/wiki/William_Herschel
[2] https://en.wikipedia.org/wiki/Uranus_(mythology)