Mrs. Skewton has a young servant who pushes her in a wheelchair. His name is Withers, quite possibly chosen because it also is the part of a horse which bears the load.

Webster's Revised Unabridged Dictionary (1913)

Withers \With"ers\, n. pl. [Properly, the parts which resist the
pull or strain in drawing a load; fr. OE. wither resistance,
AS. wi[eth]re, fr. wi[eth]er against; akin to G. widerrist
withers. See With, prep.]
The ridge between the shoulder bones of a horse, at the base
of the neck. See Illust. of Horse.

Let the galled jade wince; our withers are unwrung.
Jane Withers went from child actress to screen star over a seven-decade career.