In the crown it passed to George II, and then to George III (who was the grandson of George II and succeeded him because its father, Prince Frederick, had died) was the first in this line to be born with three names, George William Frederick. And then George III’s son and successor, George IV (born George Augustus Frederick), actually gave his daughter and only heir a middle name.
However, Princess Charlotte Augusta predeceased her father, so George IV’s younger brother, another William Henry, succeeded him as King William IV. (So the current prince williama.k.a. William Arthur Philip Louis, who as the eldest son of the reigning monarch is now the Prince of Wales, will likely be William V.)
On the other hand, William IV also did not bother to make it official with any of the ladies in his life, so his innumerable children could not succeed him. When he died, the monarchy turned to his niece, who was the only Legitimate son of William’s next living brother, Prince Edward.
that niece was Queen Victoriawhose 63 years and seven months on the throne was a record until Queen Elizabeth II surpassed the mark in 2016 and ended up reigning for 70 years.