Its source gives its meaning as valiant. Though originally a given name, it is more popular and well known as a surname. The surname's first variant is O Ã³ (Raghallaigh descendent/Of Of) raghallach which was later adapted In english As'O reilly which itself has been anglicized Into. reilly
The word 'vatican' comes from Latin and is a contraction of two words in the following way: 'Vatis' = 'profetic' or 'diviner' 'Can' = 'serpent/snake'. These two words combined make: 'the profetic- or made devine serpent'. The Vatican is a place, so you may say, that 'Vatican' means 'the place of the profetic- and worshipped serpent'.
Some may object that it is Rome, and not that small part of it known as Vatican City, which is built on seven hills, and that the Vatican can hardly be called a great city, Though both objections are true, the words Vatican and Rome are universally used interchangeably.