I quite like the Lioness Line. The Watford DC lines have never really had a good name before and that names ties in with popular public opinion.
The Windrush Line is also quite well considered as it has a direct relationship to local history & people there today. No combination of East London / South London / Croydon Line would have worked.
I found the Weaver Line a bit odd at first, but the linkages of the area do make some sense. The Lee Valley Line cannot work really as only one of the routes are named as such already.
I love the Liberty Line, it has so many linkages to the area, Liberty of Havering as on the coat of arms, Royal Liberty School & the Liberty shopping centre. The name was chosen in 1964 due to naming disputes between Romford & Hornchurch DCs
I find then the names begin to drift a bit.
Yes the NLL passes through Mildmay Park, but that is it! It is and always was the North London Line. OK a clash with the non-geographically named Northern Line, but that one is a bit obscure.
I agree, nobody wants a line called the GOBLIN, but that name chosen is super obscure. I can imagine that the line with all its issues being known as the suffering line!