I just took a look at some mishnah manuscripts from Argon's links in this answer. The word appears three times in Kesubos 7:6. The language there is very similar to the language used during kiddushin and may even be the source, although דת משה ויהודית/ישראל in the two cases are not referring to exactly the same laws.
The Kaufmann A50, a Western manuscript ...
Perhaps since Memuchan and Haman are both in the Megillah, we identify one as the other "Memuchan hu Haman".
However, when we want to identify Hasach as Daniel, who doesn't appear elsewhere in the Megillah, we note that Daniel is called Hasach, but we can't say that Hasach is Daniel, because Daniel is not present in the Megillah, so it would be awkward to ...
Daniel really should be written in the
Megilla but we can’t (due to gimatria of
Haman ) so “we call him hasach
Haman we call a negative name when we
can because ................
We do that to all avoda zoro
The TORAS CHAIM on :חולין צז ...............
Says the reason he put the slave deed on his
Leg was to remind haman that this slave
Sale Fight is an old fight ...............,...........
Which Began when the מלאך broke Yaakovs
Leg ,fighting over the בכורה sale of esav
And Mordechai and haman sale fight was just a continuation of the old old fight