It's difficult for anyone to help with just some last names. Do you have any Locations - Country - Province/Region/State - of b, m, d for the people you are seeking?
Can you provided any dates or approximate dates of b, m, d?
Do you have any first names - of parents, spouses, siblings, children that you might be seeking?
Any clues that would aid this search can be added by clicking comment next to your question and adding some details. Good Luck