"Filipino" on Googlelab

I've just tried the Ngram viewer of Googlelab, which can find recurrences and the frequency of words through centuries of texts. I searched "Filipino" and found something interesting. The word first gets used towards the late 19th century, of course, then usage spikes through the 20th after the American occupation. But there's a slight bump sometime around 1725 which I couldn't figure out. Was the term "Filipino" already in currency back then? A quick search of the available texts gave me the likeliest clue: Rizal would have mentioned something about the Filipino before the 19th century, specifically his annotations of Morga. Aha.