Sentence:  It's an awkward name: Isamay, pronounced Is-a-may. <WSD>Isa</WSD> is my paternal grandmother's name (shortened from Isabel) and May my maternal grandmother's (it comes, somehow, from Margaret). The amalgamation is, as you see, strictly alphabetical. Life, I feel, would have been much easier if they had chosen Maybel. 
Meaning of the word marked with <WSD> tags:  (diminutive=Isabel) or of its variant forms, sometimes also used as a formal given name.