Again this is very interesting. I realise now, that I have little idea of naming traditions in Spain. Almost no Old Testament names before the 20th century – I guess this is due to the fact that Spain is a Catholic country. You won’t find many OT names in Germany either before the 19th cent., but a couple did come into use like Lea, Rebecca or Samuel in the 16th cent. The Reformers pushed them into the public as an opposition to Saints’ names. I found this in an online dictionary: isabelino,-a adjetivo Elizabethan, of the Spanish Renaissance So ISABEL must have long been the Spanish form of Elizabeth/Elisabeth, and I don’t see, how ISEBEL should come in with this.