The name Rachael is a girl's name of Hebrew origin meaning "ewe". Rachael and is often added to lists like Hebrew Baby Names and discussed in our forums with posts like "Picky Parents - Sibsets Version".
From the experts:
This form of the Biblical Rachel is well-used despite its somewhat counter-intuitive spelling which can make English speakers think the name should be pronounced with a k sound, as in Raquel. The spelling may be inspired by Michael, but it's pronounced just like Rachel, with a soft ch. Lately it's on the decline, dropping more than 100 places in 2009 and leaving the US Top 1000 in 2013.