The sister of the 1930s boxer King Levinsky - who was also his manager - was known as Leaping Lena Levinsky:
For a portion of his career, Levinsky was managed by his sister Lena (Kraków) Levy. Known as "Leapin Lena", she was a colorful character who swore like a sailor, and rooted loudly for her brother during his bouts.
https://en.wikipedia...i/King_Levinsky
I found a couple of references in the British press to her, but they date to 1934 and 1937, so perhaps by then it was an epithet generally applied to a lot of people called Lena? There was also a South African frog called Leaping Lena entered in a 1950s world frog jumping championship ...
The wonderfully titled book 'Stunned Mullets and Two-pot Screamers', which is a dictionary of Australian colloquialisms, says it was also applied to the train between Birdum and Darwin.
'Green's Dictionary of Slang' suggests it's an American colloquialism for a small car. It seems to have been used for various 'clown cars' as well.
However, could this be the origin?
http://gamecatalog.o...e/?gameid=20580
There's one currently for sale on eBay: item # 373427431063