The Hauteville family is said to descend from Hiallt the later family 's toponym coming from this town .
Hiallt is a Norseman who is said to have settled in the Cotentin and founded the village of Hialtus Villa ( Hauteville ) in 920 .
The Hauteville family is said to descend from Hiallt , a Norseman who is said to have settled in the Cotentin and founded the village of Hialtus Villa ( Hauteville ) in 920 , the later family 's toponym coming from this town .