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In addition to the etymology given by Merriment, "Latchman" and "Lachman" are also Jewish names (both first names as well as surnames), and are supposedly a literal translation of "Isaac" (meaning, "he laughs"). Although, as noted, the actual meaning of the British surname "Latchman" has nothing to do with laughter.

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Although I couldn't find you any online sources stating that Latchman is a secular name used by Jews for "Isaac", I did find you a couple of sources for the surname:

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http://www.gaminggeeks.org/Resources/KateMonk/Middle-East/Jewish/Surnames.htm

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http://www.shtetlinks.jewishgen.org/Kolomea/nameorigin.htm

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-- Nanaea