ok so we have a first name and a last name lol

we want a middle name that means something to us, and we want it to represent our Nan's who have passed

'Betty' and 'Barbara ' for the life of us we cant work out how to combine these names to make a middle name

we have started saying mayb just using 'bei' or bea'

so it would be just like a letter for the middle name

is this silly? can anyone think of any other suggestions ?