MP:
« if “Targum” always means Targum Onqelos. Thanks.
All the best from Michael»
As per the Talmud Onkelos translated Humash and Yonassan ben Uziel translated N'vi'im
The nature of Targum YBU on Humash is shrouded in mystery, and afaict Rashi never saw it. [Even RMF/IM expresses some reservations re: Targum YBU on Humash re: Lo Silbash ICW a woman wearing a Tallis.]
Also note that there was/is a Targum Aquila and a Targum shiv'im on Humash.
Shalom and Regards, RRW
It's interesting that there was also a Greek Targum by Theodotion,
whose name is a Greek translation of Yonatan.
It's not a mystery, it's just a misprint. It's "tof yud", and some
half-educated bochur hazetzer thought the yud stood for Yonasan, and
helpfully added the author's father's name as well. TY probably stands
for "targum Yerushalmi".
It's the same sort of "helpful" printer's emendation that gave us
the sefer "Hilchos Eretz Yisroel" that is quoted in the first tosfos
in Chulin. There is no such sefer, there has never been such a sefer,
but the printer saw the abbreviation "alef yud" in the manuscript and
decided to expand it for the benefit of those less-educated than himself
who might not know what it stands for. AY actually stands for "Amar
Yehoshua", a medieval sefer halachos that is probably a Karaite hoax.
(Tosfos quotes it only to refute it, not because the author thought it
a reliable source!)