Best Name Combinations?

Hi! We have BG twins Elliot Alexis (Girl) and Ethan Blake (Boy) and we are expecting again with a very high chance of having twins again! we want the names to stay coordinated as either all 4 having "E" names, or the new set of twins sharing the same first letter. We also have an ABC order with our 3 year olds middle names and want to continue that on so please give us some suggestion for first names, and middle names that start with a "c" or a "d". The names we like so far are Boy- Elias/ Eli Girl- Emmalyn/ Emmalynn/ Emalyn/ Emalynn Thanks for your input!