According to Wiktionary, Emma is pronounced as /ˈɛmə/ but I tend to hear it sounding more like /ˈɛmɑː/. However, when it comes to pronouncing Emma's, I hear it like /ˈɛməz/ and I hear a clear schwa there.
Here are the samples for /ˈɛmɑː/ (Watch them at 0.25x playback speed):
American: 1, 2, 3, 4, 5, 6, 7, 8
If you listen to the samples at 0.25x speed, you'll notice that the letter a in /ˈɛmɑː/ sounds longish compared to letter a in in /ˈɛməz/.
Here are the samples for /ˈɛməz/ (Watch them with 0.25x playback speed): 1 , 2 , 3
I must say the length of the letter a in the Aussie accent is somewhat longer compared to other samples.
Assuming Wiktionary is incorrect, why is it that Emma's pronounced as /ˈɛməz/ instead of /ˈɛmɑːz/?