Early-attested site in the Parish of Middlesbrough
- Arus(h)um 1129 Guis 1218–34 Whitby 1160–70 YCh
- Aresum 1119,a.1199,1222–40 Guis
- Arsum 1222–40 Guis 1285 KI 1303 KF 1336 Ch 1412 YI
- Arsham 1577 Saxton
'(At) the houses near the river' v. a , hus . The original form of the name is ON í ár -húsum (ár = gen. sg. of á , and húsum = dat. plur. of hús ), which is the origin of the Norw place-name Aarus (Rygh, NG ii. 23, etc.).