Which of the following names was not used by a Scottish King?

The first 'King of Scots' (Middle Scots: King of Scottis, Modern Scots: King o Scots, Scottish Gaelic: Rìghrean Albannaich) was Kenneth MacAlpin (Cináed mac Ailpín), who founded the state in AD 843. In the 1175 years since then, there have been several kings known by the name of 'Kenneth', several others have gone by the name of 'Malcolm' and, perhaps more surprisingly, there have been three called 'Constantine'. No Scottish king has gone by the name of 'Angus'.

The title of 'King of Scots' fell out of use in 1707, when the Kingdom of Scotland was merged with the Kingdom of England to form a single Kingdom of Great Britain. Thus Queen Anne became the last monarch of the ancient kingdoms of Scotland and England and the first of Great Britain, although the kingdoms had shared a monarch since 1603, from the Union of the Crowns. Her uncle, Charles II, was the last monarch to be crowned in Scotland, at Scone in 1651. He had a second coronation in England ten years later.