Aaron
This comes from the Hebrew, 'mountain'.
Abraham
From the Hebrew 'Abram', meaning 'father of the people'.
Adam
From the Hebrew, 'earth'.
Ainsley
Scottish for 'own place or field'.
Alain
A French form of 'Alan', meaning 'in tune'.
Alan
An old Celtic name, meaning 'harmony'.
Alastair
The Gaelic version of Alexander, 'defender of men'.
Alexander
From the Greek 'Alexandros', and meaning 'defending man'.
Algernon
From the French, and meaning 'one who has whiskers'.