Sentence:  It's an awkward name: Isamay, pronounced Is-a-may. Isa is my paternal grandmother's name (shortened from Isabel) and <WSD>May</WSD> 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:  (from=English), pet name for Mary and Margaret, reinforced by the month and plant meaning.