Anyone have tips for recognizing the country of origin by a surname?

Question:

Anyone have tips for recognizing the country of origin by a surname?

There are names that I know are Irish or Scotch-Irish like McFaddon, McElroy etc. What are some other names that can be identified.
"edder" at the end of a name would be German right?
Tips and information please!

Best Answer - Chosen by Asker: Names ending in "dottir" or "son" are usually Scandinavian, esp. Icelandic, as they still use the father's name as the last name with 'daughter' or 'son', as in John's son = Johnsson, or John's daughter = Johnsdottir. This was common in many languages at one time. Lithuanian names often end in "-itis", as in Vyts Bylitis, or '-as,' as in Gladys Veidemanas, et al. Names ending in "-ian" are often Armenian. Names ending in "-as" may often be Greek. "Van..." names are often Dutch. Names ending in "-vich" (son of) are often Russian or Slavic. Longish names ending in "-korn" are often Thai. Names beginning with "Nb" or "Nm" etc. are often east African (Bantu people, I believe). Names beginning with "Ng" are more likely to be Vietnamese, as in "Nguyen." Hmong names are very short, often ending in a vowel (including '-ng'), such as "Hlee," "Choua," "Moua," "Cha," "Vang," etc. although some have re-taken longer Thai-sounding names.