Hi Rick, Ligan came from word of LIGA. in Javanese term (Jawi Kawi), Liga mean without clothes (Ngeliga = Ora kelamben). So, in Java ...the keris Ligan is a keris without warangka.
Never heard keris dapur Ligan in Lombok or Bali
I read in one of webside that LIGAN = Keris from Bali and Lombok with a Pedang shaped blade.
Is it possible that KERIS LIGAN = KERIS PEDANGAN?
Here I have pics of Keris Pedangan (big one with 55 cm blade only).
(Small blue pen at the top corner of the pic just to compare).