Worldwide, Mary-Clare (Mary-Clare 
) is a very rare girly first name. The given name Mary-Clare is characteristic of Australia, where it is a rare feminine name, the United Kingdom, where it is a very rare female name, and the United States, where it is an extremely rare feminine name. Very seldom, Mary-Clare is the last name as well as the forename. Parts of the name also exists independently as a first name Mary, and a first name Clare.
| VARIANT | COUNTRY |
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| Mary-Clare | United Kingdom, Australia, Ireland, United States, France |
| mary-clare horn former wife of 15th Earl of Lindsay, and later wife of Timothy Horn; daughter of 2nd Baron Montagu of Beaulieu (1928-2016) (b. 1928) |
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| mary-clare critchley-salmonson (born 1947) (b. 1947) |
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| mary-clare waugh researcher (ORCID 0000-0003-2627-9495) |
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Dy, Waltz, Walsh, Mackay, Miller, Mulloy, Mccabe, Stokes, Stucky, Smiley, Swanke, Albert, Arkcoll, Cronin, Svilicic, Kennedy, Doherty, Johnson, Treglia, Newsham, Watkins, Stakelum, Holst, Tully, Tomes, Thain, Day, Apap, Cook, Pugh, Rich, Dunn, Endy, Hill, Fred, Wise, Conheady-Barker, Sharp, Bates, Bagot, Bosco, Brown, Ridge, Dever, Deane, Leigh, Lyons, Jones, Switz, and Blacklaw