That’s true, but there is no continuity with the old use of the name. Jennifer was presented to the UK and US as a strange name by George Bernard Shaw and gaine

That’s true, but there is no continuity with the old use of the name. Jennifer was presented to the UK and US as a strange name by George Bernard Shaw and gained popularity just because the play was popular on radio and the name sounds nice. Later use in TV made it a top name. I would bet that there are more girls named Guinevere than girls named Jennifer for philologist reasons. :)