From PNWS*śṭn 'to be(come) hostile, to accuse'. Borrowed in Russian in the XVI^th cent. from Arabic via Turkish šäitan, Tatar šaitan, cf. in other Turkic languages (Kazakh, Kyrgyz) шайтан алгыр 'Damn it! What the hell!'.

PIV 2020 https://vortaro.net/#diablo_kd

From Proto-Finnic *perkeleh, from the root *përku, borrowed from Baltic (compare Latvian pērkons, Lithuanian Perkūnas), more specifically the name of a Baltic god of thunder. The term was adopted as a term for the devil during the Christianization of Finland (it is attested in this sense since the time of Mikael Agricola (output c. 1543–1552)), but it was likely an expletive even before then, and may even have been borrowed into the Finnic languages as an expletive to begin with.

Usually considered to have a particular strength or seriousness compared to other swear words, despite not being considered as dirty. Quite often considered a stereotypically "Finnish" word, used for such effect in informal contexts.

Kallio, Petri (2020–), Yhteissuomalainen sanasto [Common Finnic Vocabulary]‎ https://sanat.csc.fi/wiki/Etymologiadata:imsm:p%C3%ABrku%E2%87%92 
Erkki Itkonen, Ulla-Maija Kulonen, editors (1992–2000), Suomen sanojen alkuperä, Helsinki: Institute for the Languages of Finland/Finnish Literature Society, https://kaino.kotus.fi/suomenetymologinensanakirja/ 
Häkkinen, Kaisa (2004), Nykysuomen etymologinen sanakirja, Juva: WSOY
Junttila, Santeri (2015), Tiedon kumuloituminen ja trendit lainasanatutkimuksessa: kantasuomen balttilaislainojen tutkimushistoria‎, University of Helsinki (PhD), page 95 http://urn.fi/URN:ISBN:978-951-51-1842-4 

διάβολε is vocative singular of διάβολος

Bokmål and Nynorsk