It's not really a coincidence. I compiled evidence on Scored that Prince Vladimir adopted the trident on his coins *because* he had conquered the Khazars who used it; his father's tamga was markedly different. However, those who credit the Khazars with converting to Judaism must also credit Kievan Rus with converting to Orthodox Christianity about 988, so the trident tamga thus becomes a symbol adopted by Christians.
In its modern incarnation it draws on many different traditions including these two. Therefore even with the Jewish conversion there are many strands of symbolic input, not just Jewish.
In its modern incarnation it draws on many different traditions including these two. Therefore even with the Jewish conversion there are many strands of symbolic input, not just Jewish.