Morillard is known as an instrument maker only from an astrolabe in the Oxford collection. The signature on the instrument records all that we know about him: he came from Lyon and worked in Narbonne. He signed himself as "Fr. Morillard" which could mean either that he was a monk or that his first name was François.
Astrolabe, Signed by Morillard, Narbonne, Dated 1600 (Oxford, MHS)