Born Jean Lizette Buck according to Memory Alpha; a search on Google found nothing for Jean Lisette Buck but Jean Lizette Buck found this, https://archives.lib.state.ma.us/bitstream/handle/2452/747111/Middleton-1954.pdf, in which a woman with that name got married in 1954 in Massachusetts. Assuming it is the same person it's unknown why her middle name is spelled differently.