http://www.kami.demon.co.uk/gesithas/OEsteps/pronounc.html
From this site, it appears that the pronunciation is
LLAFF-mazzeh
where "LL" is as in Welsh (sometimes described as unvoiced "L"), the
first "A" is as in "swan", the second "a" as in "cat", the final "eh"
as "e" in "bed".
CJ