Alastair

Gender	Masculine
Language(s)	English
Language(s)	Scottish Gaelic
Word/name	Alasdair

Alistair is a masculine given name. It is an Anglicised form of the Scottish Gaelic Alasdair. The latter is most likely a Scottish Gaelic corruption of the Norman French Alexandre or Latin Alexandrus, which was incorporated into English as Alexander. Ultimately the name derives from the Greek . Another, not nearly so common, Anglicisation of Alasdair is Allaster.

...
Wikipedia