Crimean Gothic
Fragment of a discussion from User talk:Rua
@Eiríkr: I would assume English svelt is just another spelling of svelte, which seems to have a different origin.
@Wakuran: Modern Swedish does have svält (Old Swedish svælter), which is indeed probably influenced by the verb form svälta (Old Swedish svælta); but older Swedish also has sylt (Old Swedish sulter, sylt and sylter) and Danish has sult. I have now discovered, however, that Swedish also has an obsolete svalt (Old Swedish svalter), which does seem to be < *swaltaz.