5: Oleg Veleslavich -New Name (NP)

Submitter desires a masculine name.
Language/Culture (Russian) most important.
Spelling (Veleslavich) most important.

Oleg - masculine given name found in "A Dictionary of Period Russian Names" by Paul Wickenden of Thanet (https://heraldry.sca.org/names/paul/o.html), which cites 'Oleg Rianzanskii' in 1393, s.n. Oleg.

Veleslavich - patronymic based on Russian name Veleslav (m) -- "bold glory" found in "Paul Goldschmidt's Dictionary of Period Russian Names - Section VA". No date given. The variant Velezlaus is dated 1317 and Velislav is dated 1144. (https://heraldry.sca.org/names/paul/va.html)