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Which of Ghenghis Khan's son took over after his untimely death?

Ogedai.

Who wrote the operas: Orpheus in the Underworld and The Fair Helen?

Offenbach.

Who was the great Russian playwright known for his works: The Poor Bride and The Dowerless Girl?

Otrovsky & otrovosky.

Which explorer introduced the avocado into Europe in 1526?

Oviredeo & oviredo. It was called awa gualt, and avocadoes actually became popular in Europe after WW1.

Which philosopher was made famous by reducing the entia and its multiplicities through Thomistic and Aristotelian over-synthesis? Or simply put who cut away all the philosophical garbage with his razor-sharp logic?

Ockham.