When picking up words/phrases, Alfie has always preferred male voices. He does mimic me sometimes but if I want him to learn something I'm better off asking a male to say it as he'll seemingly pick it up quicker.
My dad has been helping out lots with all my house renovations so Alfie has picked up my dad yelling my name. And now he uses it with gusto. It actually caught me out once because my dad had been round and left, then I heard him yell my name from downstairs. I assumed he had forgotten something and had come back... but no, it was just Alfie. And he's spot on with it as well. He also yells my mum's name in my dad's voice.
More recently, Alfie has taken to mimicking my dad's phone calls. He'll make a phone ringing noise, answer it with 'hello' in my dad's voice, he'll mumble a lot in my dad's voice then say "alright then... alright then.... bye!" and make the phone hanging up noise. That one always makes me smile. Even though he doesn't use many words, you can tell he's mimicking my dad's voice when he's mumbling.