I call my mom Ma, too. My kids call me Ma or Mama. It’s funny but we took in some stray cat brothers in one day and kept them. A couple months later I heard Maaa-aaaa Maaaama! But the kids were at school… The kittens had learned they could get my attention immediately by mimicking my kids and that first couple times I couldn’t tell the difference. To this day their meow sounds like 'maaaa"