Why are hamburgers called hamburgers when they are made from beef and not ham?

@Adamski24 I just had to give that the BA. Lol :)

@Crazychick thank you.
I do love a good burger

@Adamski24 Me too. That pic is too cute to not get a BA. Lol :)

@Crazychick
I like mine from GBK they have the best burgers I think.

@Adamski24 I haven't been there tbh. At least it's not McDonald's, that alone makes it good.