Slee origin England
SLEE is listed in
Reaney, Percy H. 1880-1968. 'A Dictionary of English Surnames'. Oxford University Press. Oxford, NY. 1997.pg. xli, 302.
first found in England in 1274.
Slee, Slay
Stephen del Sle 1274 Essex
'Dweller by the grass-grown slope'
Old English slea, as at Slay Down (Wilts). v also SLAY
sharon