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While I appreciate the personal attacks, I never the less disagree with your conclusion. The 3 IT-related names you mention (2 in fact. I have been unable to find any sort of software or otherwise IT-related technology named Peru). It seems fairly obvious that Java and Apple should link to respectively, the land mass and the fruit, as those are what most people would immediately relate with those words/names.
While I'm sure Jean Auguste Dominique Ingres is a famous artist in his own right, he's hardly comparable to artists like Picasso, Da Vinci, Goya etc. which have achieved a general recognition also outside of art circles. If you look at artists like Andy Goldsworthy, Sebastião Salgado, Ansel Adams, you'll notice that Goldsworthy and Adams simply goes to a disambiguation page, while Salgado is an article on some obscure Brazilian village.
If Ingres the artist had been a generally well known person/artist, I would have agreed with you, but as it is, it's 2 separate interest areas with an equal claim to the article namespace, and considering Ingres the rdbms is actually named Ingres, while Ingres the artist is only part of the artists name, I think it makes more sense to keep it as it is, with the disambiguation link at the top of the article, pointing to Jean Auguste Dominique Ingres