What does David mean?
From the Hebrew name דָּוִד (Dawid), generally derived from the root dwd meaning 'beloved' (also linked to a word for 'uncle'). Borne by the great Old Testament king, it is one of the most securely attested 'beloved' names.
What does William mean?
William is a Germanic name meaning “resolute protector,” from wil (“will, desire”) and helm (“helmet, protection”). William the Conqueror brought it to England in 1066, and it has been a royal staple ever since.