The name of an Indo-European god of thunder and/or the oak may be reconstructed as *perkwunos or *perkunos.
Another name for the thunder god contains an onomatopoeic root *tar-, continued in Gaulish Taranis and Hittite Tarhunt. Germanic *Þunraz (Thor) (Þórr) is from a stem *(s)tene- "thunder".
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From IE *perkṷu- "oak-tree":
And without suffix -k-, from IE *perō(ṷ)nos "thunder, Thunderer", which possibly connect with *perūn(V) "mountain, rock":
Perkūnas' wife was named Perkūnija or Perkūnė (Perperuna, Przeginia[4]). Compare also Icelandic Fjörgyn, (with Germanic p → f sound shift) the mother of Thor, the Norse thunder god.
*perk(w)unos is reconstructed on the basis of Perkūnas. Parjanya is no exact cognate, see below. The labiovelar is reconstructed due to a Centum word for "oak", "coniferous tree", or "mountain", "coniferous mountain forest", *perkwus. Here also, the labiovelar is non-trivial, and indeed singular in the sequence *-kwu-, its justification being in Latin quercus "oak", the result of an assimilatory Italo-Celtic sound law changing *p...kw to *kw...kw (compare quinque, Irish cóic vs. Sanskrit pañca "five", coquo vs. Sanskrit pacati "to cook"). Celtic *Ercunia, if cognate, did not partake in the assimilation, advising towards a cautious reconstruction of *perk(w)us.
*perk(w)unos, then, is the god of the *perk(w)us, comparable to Germanic *Wodanaz being the god of the *wōþuz, by virtue of the same suffix *-no-.[5]
The original meaning of this u-stem *perkwu- appears to be concept of an oak, a coniferous forest, a mountain forest, or a wooded mountain:
Fittingly, there is a sanctuary to Perun located on a height called Perynь near Novgorod (It is located on the northern shore of Lake Ilmen where Volkhov River starts. Nowadays there is a church and a monastery). In south-western Bulgaria is the Pirin mountain range.
As seen from the cognates above, the name of the thunder god is only to be ascertained in Baltic and Slavic, but mythological connections of the thunderer with oaks, or wooded mountains may be reconstructed to be associated with the Proto-Indo-European word.
Further etymologization was attempted with reference to a verbal root *per- "to strike", in reference to the thunderbolt and the violent nature of a thunder god in general.
This is well attested (it survives for example in press). A velar extension *per-g- is known from Armenian harkanem "felling trees, slaying", Old Irish orcaid "slay" (e.g. in Orgetorix) and Hittite harganu- "destroy". Parjanya is consistent with such a voiced velar, and rather than being cognate to *perk(w)unos appears to be an independent derivation from this root.
A closer relationship of the verbal root to the theonym is not apparent, because of the missing *-kwu- extension, unknown as an Indo-European suffix, and the semantic distance between "slaying" and "tree" or "mountain".
According to Julius Pokorny (IEW), Russian Perunъ "thunder god" and perun "thunderbolt" which likewise lack the velar element are indeed influenced by the root discussed, the activity of "striking down" being associated with the Balto-Slavic theonym by popular etymology.