For this Alan Alastair there are 3 different names on Yasni.
In the ranking of the most common first names Alan Alastair is on position 4588.
Male first name (German, English, Scottish): Alan, Celtic (Word format); al = the rock, came in the Middle Ages with the Normans to England significance not sure clarified, perhaps of Celtic and Breton 'al' (rock)
Male first name (English, Scottish): Alastair, Scottish (Word format); emerged as a spelling of 'Alasdair', a Scottish form of Alexander
