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Tanduay
have adopted its corporate name from its
location, a triangular region encircled
by the esteros of San Miguel and San Sebastian,
which Spanish mapmakers referred to as Isla
de Tanduay. The word "Tanduay"
originated from the word tanguay, an old
Tagalog term for isthmus or peninsula. It
also means "low-lying land" because
the entire area, including Quiapo, was frequently
flooded during the rainy season. In the
Cebuano and Visayan dialect, tanguay meant
"a place where tuba, a local coconut-based
liquor, is bought and sold".
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Later
on, commercial firms would have arms of
their own or designs that give the impression
of being armorial, just to give cachet to
their products. That is why this type of
heraldry is conveniently referred to as
cachet heraldry.