The singer-songwriter revealed the news in an Instagram post, telling fans that “we are completely in love with her” and “both mum and baby are doing amazing”.
He added that he hoped people would respect the family’s privacy and would see fans “when it’s time to come back”.
The 29-year-old is a noted fan of Pullman, and chose His Dark Materials as his book choice on the BBC radio programme, Desert Island Discs, in 2017.
At the time, Sheeran described the books as “the greatest love story ever told”.
Pullman, in turn, took the first name from the collection of hymns, Lyra Davidica, which means “harp of David”.
His Dark Materials was recently adapted for a critically acclaimed BBC series, the first series of which aired in November last year.
Dafne Keen starred as Lyra Belacqua – an intelligent and curious young girl raised in a fictional version of Oxford – who sets off on a search for her missing friend, Roger.
It is unclear whether the name “Antarctica” came from His Dark Materials, but much of the first book in the trilogy, Northern Lights, is set in the Arctic.
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