Ancillary comes from anchor, no?

No, it comes from ancilla which is Latin for handmaiden.

ancillary
1667, "subservient, subordinate," from L. ancillaris "relating to maidservants," dim. of ancilla "handmaid," fem. dim. of anculus "servant," lit. "he who bustles about," from root of ambi- "about" + PIE *kwol-o-, from base *kwel- "move round, turn about, be much about" (see cycle).

You know, some 19th century philosophers also made a career out of squeezing deep meening out of etymologies and (especially German ones) word composition.

Most economists teach a theoretical framework that has been shown to be fundamentally useless. -- James K. Galbraith