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Hammer : From OE hamor, Proto-Germanic (PG) *hamaraz and probably from a word that meant "stone"; possibly derived from a PIE root ak- "sharp" or "tip"and if so related to a whole host of words; some surprising examples are acrobat, acronym, acropolis, oxygen, eager and vinegar.
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Saw : From OE saue, PG *säge, from PIE *sek "cut" and related to words such as Saxon, scythe, secateur, section, secant , segment and insect.
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Wrench : From OE wrencan, from PG *wrankjan, from PIE *wer- "turn". Related words include adverse, wrangle, wrap, vertex.