fenianski
The term "fenianski" does not correspond to any recognized historical, cultural, or linguistic entity. It appears to be a portmanteau, possibly combining elements of "Fenian" and a Slavic suffix like "-ski," which is common in surnames.
The Fenians were a revolutionary organization, predominantly Irish, founded in the mid-19th century with the goal
The suffix "-ski" (or "-sky" in Anglicized forms) is a widespread patronymic or toponymic suffix in Slavic
The combination "fenianski" could arise in several speculative contexts. It might be a pseudonymous or fictional