This is only speculation since you haven't given us any of the information
Siri has asked for.
But names with 'ieke' in them are often Dutch nicknames (
Mieke,
Marieke for example). Nieke (not Niekie) looks like a Dutch nickname, and a google image search shows that it's used a first name and a surname in the Netherlands.
Niekie could potentially be a spelling variation of Nieke, depending on where the person named Niekie lives.

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