http://www.metmuseum.org/toah/images/h2/h2_1993.14.jpg
Above is a link to Sulayman the Magnificent's yataghan in the Metropolitan Museum of Art, dating from the early 1500s, which to my knowledge is the earliest known yataghan, apart from some examples in Croatian Museums with very questionable dating. Even those allegedly date back to the mid 15th century, from what I remember.
In the late 1300s, to my knowledge, the Ottomans had still not completed their conquest of the Balkans, and did not have any naval access to the Indian Ocean. Only once they defeated the Mameluks and gained access to the Red Sea, they established a naval presence outside of the Mediterranean. I believe their naval expedition to India sailed in 1538.
I would love it if there was a connection between Ottoman yataghans and kris from the Philippines. Unfortunately, I personally would need better evidence than the picture of a modern made fantasy sword, which might have been inspired by yataghans in its design (not convinced about this), but has none of the features of a traditional yataghan, especially when it comes to the hilt.
However, people in Bulgaria, who do not know much about swords, would call any exotic sword a yataghan, particularly any curved sword, such as a kilidj or shamshir. Some of them, if shown a kris, might call it yataghan as well. I guess, yet another piece of evidence supporting Ms. Baganing hypothesis, even if the sword examples themselves fail to do so.
Best regards,
Teodor