Related People and name of country

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Hi,I'm new to the forum but i following topics For almost 1 years now, but first time i make a topic or posting here.
i have a question or maybe a theory which is, Are peoples With Suffix Ian At end of their Country or tribe are  related to each others somehow?
 it's more likely True about iranic origin,like Almost all the nation who had related to Iranic branch of people,Had this Ian At the end of their ethnic 
Few example would be,Soghandian.iranian.Parsian(persian).Sarmartian,Scythian.Median.parthian.khawrzemian.bactrian.Ossetian
Few other example would be the people who been once part of Persian empire Directly or From satrap Like:Macedonian,Ionian. maybe few more others,which i don't know or don't remember at this moment
but it's cant be just because Persian Rule in those lands,like Ghassanids never called Ghassanian.or lakhmid never called lakhmidian At least not by Themselves and others
is it because of indo European language most of this country share?
if yes why  Germans are not germanian or for British,Britishian or for rome,romanian or irish are not irishian?
I think iranic people's using this Ian To represent themselves is That Right?
if Not what's logic behind  it?

Edited by Saman Yazdanyar - 28-Jul-2016 at 20:56