I was under the impression that the "handedness" of a massive spin-1/2 particle refers to its chirality rather than its helicity. This answer, this one and Srednicki's QFT textbook seem to use the term in that way. But this answer and the web pages here, here, here, and here use the term "handedness" to mean helicity.
I often see the statement "only left-handed neutrinos interact (non-gravitationally) with the other Standard Model particles", but (incorporating neutrino masses) this statement clearly only makes sense if "handedness" refers to chirality, because whether or not two particle species interact is clearly Lorentz invariant, like chirality but unlike helicity.
Is the usage of the term "-handed" consistent enough that we can identify one of these sets of sources as "wrong"? Or is the usage inconsistent enough that the word is fundamentally ambiguous and should never be used in technical discussions involving massive spin-1/2 particles without specifying its definition?