It might be one of those "konpyuutaa" or "Makudonarudo" type of words

Or skosh, another one they stole from us.

But, all seriousness aside, I have long been interested in this Nostratic hypothesis and am willing to accept it for consideration in my attempt to unsuccessfully understand the universe, but feel that things really do get misty that far back. Cross connections such as those mentioned by Max may indeed exist to muddy the mist further, but certainly clay ovens are very old and people that still use them most likely have a continuous tradition of using them and things that don't change much tend to keep the words for them similarly unchanged.