From everything I've heard and read, it is very difficult to separate them without killing one or all of them. The rootballs are so intertwined that separation will damage all of the plants involved. I'm sure it can be done, hopefully someone with more experience than me will be able to chime in...

Richard

How big is your palm? Its better in the long run to buy them some small ones than tear yours up, but thats jus one opinion.

If you absolutely, absolutely have to separate them, you could try unpotting and placing the entire root ball in a tub of water, washing off all the soil. Then you might be able to separate them. Likely it will set them all back.

If this is growing in the ground I'd forget it.

Don't even think about it.