Azlin, Aslin, Asselin Surnames

Aslin/Azlin
English: from the Old French personal name Asceline, a pet form of the personal name Asse (see Asselin).
Swedish (Åslin): topographic or ornamental name from ås ‘ridge’, with the addition of -lin, a suffix of Swedish family names.

Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4

Asselin
French: from a frequent Old French personal name, a pet form of Ace or Asse, Germanic A(t)zo, a pet form of any of the many Germanic compound names that had adal ‘noble’ as their first element.
Dutch: from the Dutch cognate of this personal name, Asselijn.

Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4