There is no "they". The name was suggested by the German astronomer Johann Bode. William Herschel, who discovered it, proposed Georgium Sidus (Latin for the Georgian Star) but why should anyone else accept the name of the king of the United Kingdom? Nice try to curry favour with the king, William, but no. Others went for "Herschel" (and very old-fashioned astrological ephemerides use this).
Bode was thinking that it is the name of a Greek god, the grandfather of Zeus, who was the Greek equivalent of Jupiter. His name in Greek was Ouranos, but the Latinised version is Uranus. All the other planets except Earth are named after Roman gods, so why a Greek one this time is a bit of a mystery - the Roman name for Uranus was Caelus.
It was a perfectly logical thought by Bode and became accepted. The father of Jupiter was Saturn, so why not name the new planet after HIS father? Nobody knows why he picked on the Greek name when all the existing planets were named in Latin, and there are no clues in Bode's treatise on the subject. Maybe he'd just never heard of Caelus. Bode was certainly not thinking of English-speaking schoolboy humour, as he was German.