ETA: I did find a Spock/McCoy story called Yon t'Ashaya from 2004, there's no translation note on that story as to the title. And it appears that it may have originated with a 1977 Fan-made Vulcan Language Guide which translates "love" as "aisha". However like the VLD, that document does not differentiate between canon and fanon sources.
Basically what I'm looking for is some determination whether the words come from canon (spoken in an episode or film) or extended canon (from a licenced tie-in) or fanon (fan-canon, i.e. from a fannish source, and if so, who first used the words and where).
Also, does anyone have a good source for canon Vulcan language? I.e. only the words that have been used in on-screen canon?