If you're in that hotel's frequent guest program, they should know. If you're not, their system's ability to identify you may depend on your using some combination of the same form of your name that you used before, the same credit card, the same address, and the same phone number. If these change, the system may have been programmed to conclude that you might be a different person.

Information systems should be deliberately conservative that way. Fathers and sons with the same name and address are not unheard of, as are random people with the same name and similar addresses. Mistakenly identifying someone as a previous customer when he or she is not can have embarrassing consequences. Suppose you're there with your spouse, as far as he or she knows you have never been to that hotel previously, and you're greeted with "Welcome back, Mr. Bippo!" Maybe your father was there, maybe you even know that your father was there, but it would still take a lot of explaining. Far safer not to assume that you're the same Mr. Bippo as stayed there a month earlier.