Leven (i) BrE AmE ˈlev ə n , (ii) BrE AmE ˈliːv ə n —Most rivers of this name, and the Loch, are (ii), but the river in Cumbria is (i). The family name may be either.
LEVEN
Meaning of LEVEN in English
Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012