The names Julia and Dawid - tell me the nicknames for these 2 names?

The names Julia and Dawid, they are two polish kids who go the school i help at. They are so cute (twins), they only just moved here and I would like to talk to them and adress them in a way that makes them feel at home!

i know that polish language does have like a system for nicknames and diminutives but i don't know what it is! But any nicknames you give me for these names would be great.

Thank you!!!

For Julia I would use Julcia (Yultzia), for David it could be Davidek, but I would stick with David for any boy who is more than 8.

Very nice of you to try to make them feel at home :)

Thanks so much, there both 7 so I think Davidek would be ok right? i am surprised tho, I always heard there were loads of different diminutive forms for polish names, but live and learn i guess, thanks again!

Or Juleczka (Yulechka)