It's surprising that he would 'lend his name' to such a venture. [=that he would allow his name to be associated with such a venture]
A growing amount of evidence 'lends weight/credence/credibility' to their theory. [=makes their theory seem true or correct]
A bit of grated carrot 'lends' some color to the dish. = A bit of grated carrot 'lends' the dish some color.
(..) - Why not? - It's too heavy. - Well. Will you rent me your gear for the day? I never lend out my gear. But... you still have your gun. Use it. Just do me a favor. Don't shoot out the window. (..)1994 Léon: The Professional