Origin
Maurice : French English Welsh Scottish and Irish: from the Old French personal name Maurice Latin Mauritius (see Morris).
Drummond : 1: Scottish: habitational name from any of various places notably the barony of Drummond which is probably identical with the parish of Drymen (Stirlingshire) named from Gaelic drumainn a derivative of druim ‘ridge’. It has been said that the principal family of this name are descended from a Hungarian nobleman Maurice who accompanied Edgar Atheling and his sister Margaret to Scotland in 1068 where she married King Malcolm III. However there is disagreement on whether or not this was the case.2: English: occasionally perhaps from an unrecorded Middle English personal name Dromund (Old Norse Drómundr apparently from a word denoting a kind of Byzantine galley prevalent till the 12th cent. from Greek dromōn ‘runner’).
Fitzmaurice : Irish: from Anglo-Norman French fi(t)z ‘son’ (see Fitz) + the personal name Maurice (see Morris 1) ‘son of Maurice’. This surname is common in Ireland where it has also been Gaelicized as Mac Muiris. The Irish family of Fitzmaurice share a common Norman ancestry with the Fitzgerald family. They can be traced to Thomas Fitzmaurice whose brother Gerald was the ancestor of the Irish Fitzgerald dynasty. Their father was Maurice Fitzgerald a Norman baron (died 1176).
Merrick : 1: Welsh: from the personal name Meuric the Middle Welsh form of Maurice (see Morris).2: Irish: borrowed from Welsh. In Ireland when this is not the Welsh name it might be adopted for Irish Ó Mearadhaigh see Merry 2.
Mores : 1: English: variant of Moores. This form of the surname is rare in Britain.2: French Flemish and Walloon: from a vernacular form of the French personal name Maurice (see Morris).
Morici : 1: Italian: patronymic or plural form of a variant of the personal name Maurice (see Morris).2: Hungarian: patronymic from the personal name Móric Hungarian form of Morris.3: Hungarian: possibly also a habitational name for someone from a place called Móric in Somogy County or in the Nagykunság.
Moris : 1: English: variant of Morris.2: French Luxembourgish Flemish Walloon North German and Dutch: from a vernacular form of the French personal name Maurice (see Morris). In North America the surname Moris may also be an altered form of French Maurice.3: Americanized form of German Moritz.4: Latvian: nickname for a person with a dark complexion or black hair from Moris ‘Moor’.
Morris : 1: English and Scottish: from Maurice an Old French personal name introduced to Britain by the Normans. It is derived from Latin Mauritius a derivative of Maurus (see Moore). This was the name of several early Christian saints. In some cases it may be a nickname of the same derivation for someone with a swarthy complexion.2: Irish: Anglicized form of Gaelic Ó Muirghis a variant of Ó Muirgheasa (see Morrissey).3: Welsh: Anglicized form of the personal name Meurig (from Latin Mauritius) which was gradually superseded in Wales by Morus Morys a derivative of the Anglo-Norman French form of the name (see 1 above).4: German: variant of Moritz and in North America (also) an altered form of this.5: Americanized form of French Maurice a cognate of 1 above.6: Americanized form of various like-sounding Jewish surnames (see Morse).
Mosby : 1: English (Yorkshire): habitational name from Moresby in Cumbria named from the Old French personal name Maurice Moris + Old Norse bȳ ‘farmstead village’.2: Norwegian: habitational name from any of several farmsteads in southern Norway from Old Norse mós (genitive case of mór ‘sandy plain’) + býr ‘farm’.
Mura : 1: German: altered form of some similar (like-sounding) German or perhaps French surname. It is also common in France (Alsace) where it was first recorded in the form Morrau later Murra(w).2: Italian (southern Sardinia): topographic name or nickname from Sardinian mura ‘mulberry’ or ‘blackberry’.3: Catalan: habitational name from Mura in Barcelona.4: French: rare variant of Mure.5: Czech: from a pet form of Muric a personal name equivalent to Maurice (see Morris).6: Japanese: written 村 ‘village’. It is an ornamental name now rare in Japan. Listed in the Shinsen shōjiroku. Occurrences in America probably originated in the Ryūkyū Islands or may be shortened forms of other names containing this word.
Trenaman : synonymous with Middle English atte Trewen denoting someone who lived ‘at the trees’ perhaps with reference to one of the Devon hamlets so named such as Trewyn Train or Traine; see Treen. John Treneman 1525 in Subsidy Rolls (Plympton St Maurice borough Devon) may be a descendant of Walter atte Treawen 1332 in Subsidy Rolls (Plympton Devon). Topographic surnames in -man became increasingly common in late medieval Devon; see Surnames of Devon pp. 26–8.
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Source : DAFN2 : Dictionary of American Family Names 2nd edition, ©2022 by Patrick Hanks and Oxford University Press
FANBI : The Concise Oxford Dictionary of Family Names in Britain, ©2021, University of the West of England
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