Well to Jews it is important because an important Jewish king was called David. David killed Goliath, who was an enemy of the Israelites. To everyone else, it's a nice name and means "beloved".
The male given name David has origins in the Hebrew language, meaning 'beloved one, darling'. And yet, the Irish (Gaelic) version is Devlin, meaning 'fierce, brave'; and the Welsh version, Dewey, means 'prized'. There are variations in many of the world's languages.
As a surname, David also has origins in France and Italy, so please access the related link below for further study:
Nico David's birth name is Nicolae David Hernandez.
David Was's birth name is Weiss, David.
The Cathedral. Ty Ddewi is the Welsh name for the City of St David's
David Carmichael's birth name is David Andreas Manfred Carmichael.
David Mansbach's birth name is Mansbach, David.
David Lichine's birth name is Lichtenstein, David.
David Selman's birth name is David Solomon.
David Sipe's birth name is David Sipe.
David Rintoul's birth name is David Wilson.
David Armand's birth name is David Whitehead.
David Kaff's birth name is David Kaffinetti.
David Dubinsky's birth name is David Dobnievski.