Origin of "Bangkok"

Why is the name of the capital city of Thailand "Bangkok" not used by Thai people? "Krungthep" or City of Angels is the official and normally used name.

It has been said that the name "Bangkok" comes from two words: "bang" which means "place" and "makok" which means "olives" or a Thai species of fruit looking like an olive or "Hog Plum". And that there once was a grove where the "makok" florished. Thus the place was known as "Bangmakok" ( Place of Olives) and then later shortened to "Bangkok". Throughout Thailand there are many places named according to this fashion. Such as : "Bangmot" is "Place of Ants", "Bangsai" is "place of the banyan tree", etc. I have yet to find a vestige or ikling of this grove of Thai olives or hog plums.

Now I have a new theory. Historically, it has been well documented that the Portuguese first visited Thailand, then known as Siam, well over 400 hundred years ago. It is known that the sailing ships first docked at a location near Wat Arun (Temple of Dawn) before making the upstream journey to the then capital city of Ayutthya where the Kings resided. Accordingly, the Portuguese would have to unload most their crates and barrels of provisions before making way up river in the shallower waters. A majority of the provisions consisted of olives, raisins, olive oil, wine and rum . Some of the olive casts may have split spilling some olives around the Temple of Dawn storage location. Since the Thai word for olives is also "Makok", I believe the Thai started to call this place of olives "Bangmakok" after the Portuguese olives and not the Thai hog plum. Thus the shorten "Bangkok" is used primarily in the English and foreign languages as the official name of the capital city of Thailand.