I came upon the word "xfered"...
This sentence is incorrect to the extent that 'xfered' is not a word defined in standard English dictionaries. That makes any "etymology" irrelevant.
It is not necessarily a specific word used in technical literature as such.
xferred 2 thumbs down
Abbreviation of transferred.
That car was xferred to New York.
In using short forms, the prefix 'x' is used to generally denote 'trans-' with any suitable word/ tail. This has been in practice for a very long time in the fields of physics, electronics, computer hardware and software. However, it is also sometimes similarly used for other prefixes, including as in 'xtal' for crystal, etc.
Note that this is a mere convenience practice and not a recognized short form for formal technical writing.