Callam has been registered 431 times in England and Wales since 1996. It does not appear in the American record, which publishes only names given to five or more babies in a year.
Callam has not been registered in England and Wales since 2013. Its best year was 1997, with 71 registrations. The name is absent from American records, so there is no US curve to compare it against.
Source: Office for National Statistics, baby names for England and Wales. Contains public sector information licensed under the Open Government Licence v3.0. Scores on this page are explained in the methodology.