1891 Patrick Census Index of Brian Lawson
District 2 2
QUAYLE
Caroline 10 b Patrick
Emma 44 b Peel
Emma 5 b Patrick
John 52 b Patrick
Lancelot 26 b Peel
Walter 6 mo b Patrick

Brian's birth index

QUAYLE, Emma Eliza 22 Mar 1886 Pat QUAYLE, John CRELLIN, Emma Elizabeth
QUAYLE, Wilfred 2 Oct 1890 Pat QUAYLE, John CRELLIN, Emma Elizabeth

Now we know Emma Eliza(beth)s surname is Crellin
We learn that John and Emma had their daughter Emma in 1886 and I searched the Patrick burials and there were no infant Emma Quayles buried in the 1881-1891 period so the Emma in the 1881 census was not their daughter.
We also can see how names get translated loosely
Walter in the census, Wilfred in the birth index, Henry Wilfred on the MI.
And so it goes......