I did not find your 1821 John Boyde in the IGI.
However, there is a Robert Wade son of John Boyde and Ann Wade, christened in German on December 11, 1825.
in the 1861 census, a Robert Boyde appears with his family - entry number 45 Poor Town, German. Entry number 47 is William Christian, wife Ann & mother-in-law Ann Boyde.
An Ann Boyde was christened in K Michael on June 22 1821 Note however that this is asubmission from a LDS member and not a transcription fom Paris records.
They may all appear on the 1841 census.