Sure -- for nouns derived from verbs and adjectives, just...
...like in English. Not for nationalities, which are, what, adjectives or adverbials or something? What, isn't -ian a very common suffix in English...?
Automation, from automate/automatic; gestation, from gestate; maturation, from mature(v/adj); infatuation, from youth and naivety... You chop off any vowels from the end of the verb and add the whole -ion part.
Country and regional names that end in -ia are most all from Latin, like Sarmatia/n, Armenia/n, Arabia/n, Illyria/n(*), Liguria/n, Iberia/n, Catalonia/n, Galicia/n, Lusitania/n(+), Pannonia/n, Hibernia/n... They all end in -ia already(@), so you need just add an -n and keep your fingers off the vowels.
HTH!
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*: Of which Dalmatia was a part. For more recent monikers in the same area, see YugoslavIA/N, SerbIA/N, CroatIA/N, RomanIA/N, and BulgarIA/N.
+: Typing this in the Radisson Blu Lisboa.
@: In Latin; English has often replaced this with an -y, but the -ian remains.
