Никола́евский (Russian) comes from Russian Никола́ев, from Russian Никола́й, from Ancient Greek Νικόλαος, from Ancient Greek λᾱός, from Proto-Hellenic lāwós, from Proto-Indo-European leh₂wos, from Proto-Indo-European leh₂- — to bark, howl; to be concealed.
Ancestry of “Никола́евский”, step by step
Никола́евский traces back through 3 separate lines of ancestry.