The Iron Giant (1999)
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Yes, in a deleted story board scene hints that the Iron Giant isn't the only one of its kind. When the Giant starts to sleep, his "dream" is transmitted to Dean's TV which shows brief footage of other Iron Giants.
However in the "Signature Edition" released in 2015, it is implied that the Iron Giant is the last of his kind, his planet having been destroyed by the war for which he was presumably created. Edit