This is the 7620th most frequent Swedish word.
södergran
"Södergran" is not a standard Swedish word with a specific definition; it is primarily known as a surname, notably of poet Edith Södergran.
Here, 'Södergrans' signifies possession, indicating that the poetry belongs to Södergran, the poet.
Den här boken handlar om Södergrans poesi.
This book is about Södergran's poetry.
In this sentence, 'Södergran' is used as a proper noun, referring to Edith Södergran, a notable poet.
Södergran var en framstående finlandssvensk poet.
Södergran was a prominent Finland-Swedish poet.
In this context, 'Södergran' is part of a place name (Södergranvägen), likely named after the poet or having some other association.