Early PLANK references

The earliest reference to a PLANK that I have come across is in the 13th century:

    1288  Maud de la PLANK (Calendar of Inquisitiones post mortem for Wiltshire).

There are some 16th century references in the IGI.   Here are a few:

    16/04/1543 The marriage, at Therfield in Hertfordshire, of Richard HASSARD & Elizabeth PLANKE.

    Two daughters of Rogeri PLANKE, Katrina & Agnis, were baptised at Therfield in Hertfordshire, in 1551 & 1556.

    06/1567  The marriage, at Ashen in Essex, of William SMITH & Eleanor PLANK.  Both were of Ashen.