Re: Aya = Aja in German (hope it helps)
This name is spelled Ajah and Aiah in the King James Bible. I looked it up in Strong's Hebrew Dictionary:
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345. 'Ayah ah-yaw'
the same as 344; Ajah, the name of two Israelites:--Aiah, Ajah.
See Hebrew 344
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344. 'ayah ah-yaw'
perhaps from 337; the screamer, i.e. a hawk:--kite, vulture.
See Hebrew 337
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That goes along with what Andy ;—) wrote.