Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
SHELDRAKE
As described in historical dictionaries
Patronymica Britannica (1860)
SHELDRAKE. SHELDRICK. A seafowl, nearlj resembling a duck. Gloss, of Heraldry. The family bear three in their arms. H.R. Le Sceldrake, Sceyldrake.