Go to:
Behind the Name - the Etymology and History of First Names in the site-specific search browser, choose "meanings" in the first space, and type in "blessed" in the space next to it. It had a pretty good list, from various origins, including Welsh and Hebrew/Biblical. From the Welsh, I think the name Gwendolyn, or Gwen, would look very nice on a female Dalmation.
However.... you yourself admitted it may not necessarily be prudent to adopt a third dog into your apartment right now. I do believe in "message" dreams-- I have had several that have come true-- it may be possible that your dream, and it's meaning is symbolic. That is to say, that rather than implying you should actually act on your longing to own a dalmation, perhaps your dream meant something else. I'm inclined to think that by your inclination to name the dog "Blessed" or "Lucky," that perhaps you should be expecting something positive in your life soon-- a blessing of some sort. Or, you might even be needing to take a personal inventory of your life, and make a list of blessings you have received thus far. I realize from some of your other posts eleswhere in this forum that you have suffered a lot of discouragement, frustration, anxiety, and disappointment. Your dream may be a subconscious effort to heal your psyche and find peace (or it could even be God's way of reaching out to you-- I don't know what your spiritual philosophies are). If this later thought (counting your blessings) appeals to you, go to this website:
ButterBeeHappy.com - Online Gratitude Journal - Write Happy Thoughts It is a free website you can join to start up a personal gratitude journal, and read happy thoughts posted by others to help lift your spirits and inspire you in your quest to become a happier person.