But perhaps it consoles her to think that she knows the genitive of mensa.
"Look Back on Happiness"
Knut Hamsun
And the Saxons, having often to use the word gar in this sense-much as our reporters of New Zealand affairs have to speak of a pa-distinguished the gar that was in Wiht, as Wihtgar, and then they added their own word, burh, as the interpretation of gar, and after a time the historian, finding the name of Wihtgarburh, took Wihtgar for a man, and called it Wihtgar's Burg, Wihtgaresburh, a genitive form which still lives in "Carisbrooke."
"Anglo-Saxon Literature"
John Earle
The full or the shortened name can become a surname, either without change, or with the addition of the genitive -s or the word -son, the former more usual in the south, the latter in the north.
"The Romance of Names"
Ernest Weekley