(2) i-plurals

SingularPlural
Nom.stað-r (place)stað-ir
Acc.staðstað-i
Dat.staðstǫð-um
Gen.stað-arstað-a

49. So also gripr (precious thing), salr (hall).

50. gęstr (guest) takes -i in the dat. sg., and -s in the gen. sg.

51. Those ending in g or k (together with some others) insert j before a and u: bękkr (bench), bękk, bękk, bękkjar; bękkir, bękki, bękkjum, bękkja. So also męrgr (marrow), stręngr (string).

(3) u-plurals

SingularPlural
Nom.skjǫld-r (shield)skild-ir
Acc.skjǫldskjǫld-u
Dat.skild-iskjǫld-um
Gen.skjald-arskjald-a

52. So also vǫndr (twig), vǫllr (plain), viðr (wood). āss (god) has plur. nom. æsir, acc. āsu. sonr (son) has dat. sg. syni, plur. nom. synir. It regularly drops its r of the nom. in such compounds as Tryggva-son (son of Tryggvi).

(4) r-plurals

SingularPlural
Nom.fōt-r (foot)fœt-r
Acc.fōtfœt-r
Dat.fœt-ifōt-um
Gen.fōt-arfōt-a