Keeping within two-wheeled motorbikes, I believe it's als a matter of who you ask and when. In earlier periods I am sure Piet is right. It was the small ones who made it after wwII, when everyone wanted a motorized means of transportation, and cheap and reliable.
I recent years, it's got to be the Jota name. Aske anyone who may just have a clue, or once read an article about Laverda in widespread motorpress: they allways name the Jota. Being a 3C, 3CE, 3CL, 1200, Mirage, whatever... They still thinks it's a Jota.
The whole 120 series including the 120 Jota (in old frame) is completely dead in people's mind. They simply don't know about them. The press wrote things like: A Jota it's called but it sure ain't, as they are silinced and sanitized, now following the rules of the market, etc. But ask if they know the deardfull yamaha XS750 tripple? Sure.
Old times: the small ones as Piet said.
Newer times: Jota name, no matter the bike.
Cheers,
Jacques.