Etymology of using "ya" instead of "you"

I have noticed that some people in parts of Maryland, Pennsylvania, Ohio often say "ya" instead of "you"? As in "Didya do your homework?" instead of "Did you do your homework?".

Does anyone know the etymology behind this pronunciation? I am wondering if this could be evidence of the influence of a large population of people that still speak German. Is this pronunciation also found in areas without a Germanic influence?

Solution 1:

This pronunciation isn't peculiar to that region—it's virtually universal in US speech.

As Kate Bunting and user070221 say, the vowel in unstressed you will usually be reduced to /ə/; and in rapid speech the dental stops /d/ and /t/ followed by palatal /j/ (orthographic ‹y›) will usually "assimilate" to an affricate: /dʒ/ (=‹j›) and /tʃ/ (=‹ch›). Compare gotcha! for got you!.

Transcribing these with ‹a› for reduced /ə/ and ‹j› and ‹ch› for the affricates is 'eye dialect', an effort to represent ordinary casual speech as dialectal or uneducated.