Israeli Researcher Uri Ofir mentions a theory which is found in the literature, that King David adopted this form as his emblem because of its special form which fitted his name. In ancient Hebrew (Daatz writing) the letter “d” (dalet) was written in the form of a triangle and in the name David there are two triangles (two characters of d).
The “six pointed star” is made up of two inverted superimposed paleo-Hebrew “daleths” (delets), the beginning and ending letter inKing David’s name.
– The Star of David – Defending the Shield, Flying Chariot Ministries
In the Hebrew alphabet, the letter for the letter “d” is called a dalet, and it looks triangular. Since David’s name had 2 dalets in it, the ancient Israelites used two dalets, with one of them turned (which would loosely approximate a hexagonal star), to represent that they were the armies of David.