Chains are made of a lot of oval shaped units. What is each one of them called in English?
I don't know the name in my native language either.
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You could also use "ring".
In support of this, from the Cambridge dictionary, a chain is "a set of connected things". In particular, look at the second definition: "(a length of) rings". The word "link" never appears on the page, even though I can agree with the @Max's definition.
Almost the same is stated in the Oxford dictionary - chain:
[countable, uncountable] a series of connected metal rings, used for pulling or fastening things; a length of chain used for a particular purpose