Moore has re Killip: (www.manxnotebook.com/manxnb/v03p083.htm)

KILLIP, contracted from MacPhilip, 'Philip's son.'

Compare (Gaelic and Irish) McKILLOP (English) PHILLIPS, PHIPPS.

M'KILLIP [1430], MCKILLIP [1511], MCKILLOP, KILLOP [1540], KILLIP [1604].

Ballaugh, Lezayre, Malew, German, Lonan (c), elsewhere (u).

thus a Manx name from the earliest records -