Costache

This name is actually the Romanian form of the Greek given name Κωστάκης (Kostakis):

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• https://www.behindthename.com/name/kostakis/submitted (in English) [noted -ed]

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All masculine Romanian names that end in -ache come from a Greek masculine name that ends in -άκης (-akis):

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• https://www.behindthename.com/submit/names/usage/romanian/pattern/*ache (in English)

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In this sense they are quite similar to masculine Albanian names that end in -aq:

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• https://www.behindthename.com/submit/names/usage/albanian/pattern/*aq (in English)