I would just replace "alone" with "with no one" (nid is no/nothing/none and "none" is a stand-in for "no one"). Then from your phrase "Who is bound to be alone forever" you can glean gro (bound), nid (none), ul (eternity). Then you can possibly use any of these for a name: "Gronidul" or "Nidulgro" (Groulnid and Nidgroul are awkward due to the o followed by the u)