It's interesting to me that the fandom as a whole has been almost 100% willing to embrace "Janette" (over "Jeanette"), but has had long and persistent resistance to "Lacroix" (over "LaCroix").

I imagine that we did not find out for sure until second season, because that was -- I think -- the earliest that anyone saw a script, but that is just a guess. Perhaps early articles about the show (in Starlog Magazine, newspaper reviews, etc.) muddied the waters.

(The debates about how and when to spell "Nicholas"/"Nicolas"/"Nicola" make the most intuitive sense to me, personally, as of course that varies with the language, accent, speaker, era, and intent!)