A map of Isle Saint-Jean, apparently drawn in 1764, purports to be the work of a cartographer named "W.J. Hebert". This blog post contains images and a description. The question is, who's W.J. Hebert? The blog post author thinks there's reason to believe he was British (I exchanged emails on this with him.), which is a little odd in this case but not impossible. I've suggested that it could be a copy/non-contemporaneous map by cartographer L.J. Hebert (many years later), before deciding he preferred L to W (Liam / William?) but I have yet to determine what his initials stood for.