Lonneke is Dutch and it is a female name deriving from Apollonius. What the latter means u can find by clicking on the hyperlink (but it means something as 'to
Apollo' or 'from
Apollo')
just check it
Yella i haven;t heard of. Maybe from Anyella? Which is a East Europian form of
Angela (like
Aniela, see hyperlink). But there is also the Italian name Aniello (female form might be Aniella)