hhmmmmmm, to be completely honest...i think they're too similar.
we have a Lewis as well, and he gets called Lulu, Louie, Loo...all sorts of L variations ....so i would avoid anything that was too similar with the L kinda sound iykwim? with ds2 we went for something completely different sounding starting with the letter J.
DS2 is also a Lewis, and he gets Lewie and Lew all the time. Like Mrs Mac said I think given Luca could be shortened to Lou it might get a bit confusing.
I guess it depends on how much you really love the name.
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