'so called for' is a grammatically correct phrase and it can be used in written English.
Example: The old-fashioned dress Marigold wore to the formal event was so called for the occasion.
AMERICA'S obesity epidemic is so called for a reason.
These are the snakeflies (Raphidiodea), so called for their body shape, and the dobsonflies and alderflies (Megaloptera).
It's an aluminum "canned ham" trailer — so called for its shape — popular in the '50s and '60s.
Euphorbias, like donkeytail spurge (E. myrsinites), so called for its ropes of whorled, fleshy leaves, have the same protection.
There was also the Vicar, so called for the prim picture of righteousness he presented on the outside.
The story covers four generations of the Pontifexes (so called for the parents' habit of laying down the law).
From so-called for-profit colleges, which now make up some 25percentt of post-secondary institutions in the U.S.
Charles Kennedy EastEnders Christmas Special Chat-show Charlie isn't so-called for nothing.
In London we have the Gherkin and the Cheesegrater, so-called for the skyscrapers' physical resemblance to their namesakes.
One of my favorites is White Dill (Ammi majus), so-called for the airy blossoms that the herb makes.
They outperform soshoku danshi, or "herbivore" men, so-called for taking low-responsibility jobs and preferring shopping to sex.
