George Broderick is doing Manx Place names - I think Michael has been 'done' as he has finished I think 5 of the 6 cheadings - catch is as I said elsewhere his books on sheadings cost £100 a volume though Manx museum have copy - I doubt if any one will redo his work in short term as effort is enormous.
Leslie's book does not really cover place names and on family names often he remains on fence between Moore (all of which is on line on my site - btw it's FrancEs ) and Kneen (which I may add shortly)