This is the 7503rd most frequent Russian word.
джекстона
It seems "джекстона" is not a standard Russian word or widely recognized term. It may be a typo, slang, or a proper noun.
used as a proper noun assigned to name a pet
Мой кот был назван Джекстона в честь друга.
My cat was named Jekstona after a friend.
name of a person used as the subject of the sentence
Джекстона посетил библиотеку вчера.
Jekstona visited the library yesterday.
possessive form indicating ownership or relation to a person named Джекстона