Man pages matching name s3mkbucket in section 1p:

s3mkbucket.1p.en	debian 10 / libnet-amazon-s3-tools-perl
s3mkbucket.1p.en	debian 11 / libnet-amazon-s3-tools-perl
s3mkbucket.1p.en	debian 12 / libnet-amazon-s3-tools-perl