If we compare the Chi-Rho symbol with the Hebrew Star of David (Magen David) then we see that both symbols share the same six points! While using different symbolism it would make sense without being too obvious to continue the same basic underlying symbolic structure that has been handed down from David to his Messianic heir.
– The Chi Rho, Arian Catholic Ecclesiastical Lore. Arian-Catholic.org
The Chi-Rho symbol can be directly connected to the six-pointed hexagram star…the seal of solomon, Star of David, or as the hindus described it, the mark of vishnu.
– chi ‘X’ and rho ‘P‘, by Mike Bur, CyberSpaceOrbit.com