'oak-born' (*pérkʷu-genā) or to derive from *pérkʷu-niya 'wooded mountain'. Celtiberian: berkunetakam ('Perkunetaka'), a word attested in the Botorrita Plate I and interpreted as a sacred oak grove, Pyrenees: the theonym Expercennius, attested in an inscription found in Cathervielle and possibly referring to an oak god. His name might mean 'six oaks'. Gaulish: ercos ('oak'), Gallo-Roman: references to 'Deus Ercus' (in Aquitania), 'Nymphae Percernae' (Narbonensis), and a deity named 'Hercura' (or Erecura) which appears throughout the provinces of the Roman Empire. Patrizia de Bernardo Stempel argues that Aerecura/Hercura derives from a Celtic *perk(w)ura. Irish: Erc (mac Cairpri), mentioned at the end of Táin Bó Cúailnge, and placed on the throne of Tara by Conchobar mac Nessa in Cath Ruis na Ríg for Bóinn; although an alternative etymology from PIE *perk- ('color') > *perk-no ('[spotted] fish') has been proposed by Hamp and Matasović. Greek: (κεραυνός), the name of Zeus’s thunderbolt, which was sometimes also deified (by metathesis of *; although the root *ḱerh₂-, 'shatter, smash' has also been proposed), and the Herkyna spring-nymph, associated with a river of the same name and identified with Demeter (the name could be a borrowing as it rather follows Celtic sound laws), Hittite: the words and are attested in a Hittite text of The Song of Ullikummi, and refer to a female being made of 'Rock' or 'Stone' who gives birth to a rocky creature. Italic: Italian: porca, a word meaning 'fir tree' in the Trentino dialect. Mallory and Adams suppose it is a loanword from Raetic. Slavic Pomeranian: Porenut, latinized as Porenutius in the work of Saxo Grammaticus. The name is believed to refer to a deity worshipped in the port city of Rügen in ancient times as a possible son of Perun. Romano-Germanic: inscriptions to the Matronae 'Ala-ferhuiae' found in Bonn, Altdorf, or Dormagen. Paleo-Balkanic: Illyrian: Perëndi, a sky and thunder god (from per-en-, an extension of PIE *per, 'to strike', attached to -di, the sky-god Dyēus, thus related to *per-uhₓn-os (see above); although the Albanian perëndoj, 'to set (of the sun)', from Latin parentare, 'a sacrifice (to the dead), to satisfy', has also been proposed as the origin of the deity, Thracian: Perkos/Perkon (Περκος/Περκων), a horseman hero depicted as facing a tree surrounded by a snake. His name is also attested as Ήρω Περκω and Περκώνει "in Odessos and the vicinities". Caucasus: it has been suggested that the characters Пиръон (Piryon) and Пиръа