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This is from a tendency in Germanic languages (and maybe others) to call the orange a "Chinese apple".

The word "sinaasappel" is much more common, which sounds a lot more like the Chinese apple you're referring to than "appelsien". The latter is used in a brand name for fruit juice (used to be exclusively orange juice). Besides that it's practically not used in modern Dutch.

Both sinaasappel and appelsien are derived from chinese apple (from dutch wikipedia: De sinaasappel komt oorspronkelijk uit China (in de oude vorm: Sina), waar ook de naam naar verwijst. In het vroegnieuwnederlands komt "appel sina" voor, in het nieuwnederlands "appelsien").

(Also in flemish appelsien is used far more than sinaasappel).

Russian as well. It's from silk road merchants calling oranges "chinese apples".

In Swedish as well. The fruit is apelsin. The colour is traditionally brandgul (fire yellow) but orange (pronounced like in french?) is not uncommon.