The Roman Map of Britain Gariennus River Yare, Norfolk

Liar[ienna?] (R&C 259) next
Gariennou Garienni (Ptolemy II 3 4)

Liar is for Gar, the next entry Lenda looks enough like -ienna for an eye-skip to occur.

At the mouth of the river Yare were several Roman forts, one of which was named Garianno, traditionally Burgh Castle,  but also Caister and perhaps Reedham.