Hafa Adai Sally,
I was just wondering if you found the origin of the name you search "Chaco". I've been doing research on my grandfathers middle name "Pongco". (chinese decent). Since our surnames we search share the same ending "CO". I surfed onto a site called "Catalog of filipino names". I know Chaco is a chinese name but the information is worth reading. The many names ending with -co and -ko is because co was a title of respect given to someone like an elder, or an older brother. However, Co was also a valid name so that it would be hard to say weather the "co" in the name was part of the original chinese name or was an honorific. Generally speaking, if it is at the end it would have been an honorific. An example of the is Cojuangco. Their patriach was Co Chi Kuan, who was addressed respectfully as Co Kuan Co (one given dropped). Co Kuan Co eventually bacame Cojuangco. The information came from the book author name "Hector Santos". Sorry, I lost his http address but I think you could surfed onto his site on PhilGenWeb Project. I'm glad I surfed onto it because I also found the history of the Santos name. I hope this information was helpful to you. Oh, another thing I am planning a trip to Guam this December for the holidays and plan to visit the MARC center. I remember on your last reply to me you mentioned you visited it. Was it worth the trip to the MARC ? Did you find valuable information at the place ? Please email and let me know . Thanks, Marilyn