Where does “WWW-vastaava” come from?

WWW-vastaava (Finnish) comes from Finnish vastaava, from Finnish vastata, from Proto-Finnic vastat'ak — to answer, to reply.

Ancestry of “WWW-vastaava”, step by step

WWW-vastaava traces back through two separate lines of ancestry.

via Finnish vastaava

StepLanguageWordMeaning
1Finnishvastaavacorresponding, similar, having equal effect;...
2Finnishvastatato answer, to reply; to respond
3Proto-Finnicvastat'akto answer, to reply

via Finnish www

StepLanguageWordMeaning
1Finnishwww
Every word from Proto-Finnic vastat'ak