The prolonged 'aa' sound,  pronounced as [ˈɑː], is common for words in Afrikaans language, from which the word originates. 'Aardvark' comes from original Dutch 'erdvark',  'erd' part meaning 'ground'. 

Afrikaans itself is an offspring of the Dutch language, used by the Dutch colonists in Southern Africa since 17th century.
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