Creating a csname from a macro

Question

Say I have a macro \bob and that macro is passed to another macro as an argument:

\makemacro{\bob}

I want \makemacro to create another macro, based on the name of the passed macro, say \bob@two.

This is easy with etoolbox if I passed a csname (just "bob") and not a macro:

\cslet{#1@two}{...}

but if I'm passed a macro, this of course doesn't work:

\letcs#1@two{...}

I have a feeling there is painfully obvious way of doing this but I can't see it.

EDIT: I found an answer here: Removing a backslash "\" when passing arguments to newcommand