This is the 8213th most frequent German word.
ismaël
The word "ismaël" is not German; it is a French form of "Ishmael," a biblical name.
Ismaël is a proper noun and is the name of the subject in the sentence.
Ismaël liest gerne Bücher.
Ismaël likes reading books.
Ismaël is used as a proper noun representing someone who is being referred to in the direct object role in the sentence.
Ich habe Ismaël im Park gesehen.
I saw Ismaël in the park.
Ismaël is the proper noun referring to the person who performed the action (author of the text) in the passive voice context.