Лингвофорум

Recently I've stumbled upon Slovak surname Martinisko which came under my notice due to its uncommon shape and of course it instantly aroused my curiosity about the import of *-īsko formant in it. Keeping it serves for substantives to currently convey place-hearth connotation or augmentation of things – in Rousse, namely, *-īskio for the former and *-īsko for the latter, which I could barely tie up to a proper name like Martin, it's parallelism with *-īskio brought me straight to another Rousse last name Domiscye. Though not having been sure about the base of Domiscye heretofore, Martinisko helped to clearly identify it as anthroponymic. So, the different typology of Slavic family names on *-īsk(i)o put me on burrowing some more instances thereof. Need to say, though some is found, but not much. Noteworthy the *-iskio paradigm distributes almost exclusively within the Carpathia-Galitchina (Carpatie-Galityina) region, which suggests its indigenous feature to that area. Any sporadic disseminations elsewhere is an exception which proves the rule, yet one seems to distinctly tell in Bealaroussen.

prwzufiscye	zagalyna uimulua	tuoryeno wd imene	xiryeno po/na
Costiscye	[ko`stɪʂʧɛ]	Costẽ, Costẽntin	Galityiné
Domiscye	[do`mɪʂʧɛ]	Doma, Dometian, Doment	Carpatii
Griciscye	[ɰrɨ`ʦɪʂʧɛ]	Gric, Grigwr	Carpatii
Griniscye	[ɰrɨ`nɪʂʧɛ]	Griny, Grigwr	Galityiné
Ifaniscye	[ɩβɑ`nɪʂʧɛ]	Ifan	Foluini-Podwlii
Pafyliscye~Pauliscye	[pɑw`lɪʂʧɛ]	Pafylo~Paulo	Carpatii, Galityiné
Petriscye	[pe`trɪʂʧɛ]	Petro	Carpatii→Cuiywfysciné→'Foutr'(Oucrayinõ, Dicopwlie)→Bélorousi

One more probable surname Pilipiscye (< Pilip) needs firmer evidence for attestation.
Alonside the Martinisko last name I found only one more with the -īsko formant - Stephanisko (Czech(-Moraw)-Slovakia) or Stepanisko (in Roussemark).