The COSTILOW Family

This page provides details about various Costilow families in my attempt to piece them all together. Autosomal and yDNA research has helped significantly with making a lot of these connections within the last decade. The Costilow families and their documented descendants are numerous, to say the least, and it's quite apparent that they're a very prolific family. There's been much confusion about a great deal of research regarding the Costilow family, so this is my hope of setting everything straight with clear, factual evidence.

The records that described our family has our surname written in many different ways; some are blatant clerical errors:

• CA: Calesblow, Castalow, Castello, Castelow, Castillo, Castilloe, Castillon, Castillow,
  Castilo, Castilow, Castlo, Castlow, Castolow, Castleton, Causterler, Caustelow

• CHO: Chostolo

• CO: Costaloe, Costalo, Costeloe, Costelow, Costell, Costello, Costellow, Costet, Costillo,
  Costiloe, Costiloo, Costilow, Costillow, Costlair, Costloe, Costlow, Costlo, Costoloe,
  Costolow, Costolo, Costow, Costulo, Crosdelow, Crosdilow

• CU: Cutlol

• Costilow yDNA Results
  yDNA is passed down from father to son. Two male line Costilow descendants have taken a yDNA test and our paternal line is undeniably Irish.

• Costilow mtDNA
  I'm looking for a female-line descendant of Margaret Costilow (m. Jonathan Adams in 1791), presumed daughter of Christopher Costilow, willing to take an mtDNA test at FamilyTreeDNA. mtDNA is passed down from mother to daughter and it could help us identify the unknown wife of Christopher Costilow.

• Costilow Autosomal DNA Results:
  Discusses the potential African and/or Indigenous American heritage of the extended Costilow family.

  • • Costello Autosomal DNA matches in Ireland

• Custaloe-Custillo Enslaved & Free People of Colour
  The "free people of colour" of early 18th century Virginia, detailing a free family of mixed African and Indigenous American origins.

• Anson-Mecklenburg Counties NC Castillo/Costello Family

• Honour Costello
  Transported from London to Annapolis, MD in 1756.

• Bridget Castillo of Fairfax County, Virginia

• Stephen Costello (father Laurence Costello)
  d. abt 1775, Clonfert, County Galway, Ireland
  
  The other Costello in the Clonfert Graveyard:

  • • Edmond Costolo (1719-1759)

    • James "Jim" Costillo (1709-1791)

    • John Costello (d. aft 1822)

    • Martin Costello (1723-1773)

    • Thomas Costoloe (d. abt 1834)

    • William Costello (d. aft 1775)
      
      

• Costello Church Record Extracts (Galway & King's/Offaly Counties)

Costilow Family in America:

Generation 1: Christopher Costilow & NN Holder
Generation 2: Edward Costilow & NN Garrison
Generation 3: James Costilow & Mary Bethiah Hopkins
Generation 4: James Andrew J. Costilow & Martha Ann Miller
Generation 5: Samantha Aylene Costilow & Samuel Christopher Columbus Martin

Unknown Loudoun County, Virginia Connections:

• Hannah Castlow (likely a granddaughter of Christopher Costilow)

• Jane Costalow (likely a granddaughter of Christopher Costilow)

• Sarah Costillo (likely a daughter of Christopher Costilow)

Index to the prerogative wills of Ireland, 1536-1810, by Sir Arthur Edward Vicars (1864-1921)

1719 Costello Charles, gent.
1738 Costello Charles, Tobrackan, barony of Costello
1770 Costello Edmond, Dublin, esq.
1742 Costello Jas., Tallaghan, Co. Mayo, gent.
1776 Costello Jane
1762 Costello Michael, Jamaica, surgeon
1778 Costello Peter, Jervis-st., Dublin, gent.
1807 Costello Phillip, Dublin, coach maker
1775 Costello Stephen, Clonfert, Co. Galway, farmer
1804 Costello William, Ballyfeighan, Co. Meath, farmer

1734 Costelloe Anthony, Dublin, gent.
1735 Costelloe Catherine, Dublin, widow
1735 Costelloe Dudley, Tobrackan, Co. Mayo, gent.
1791 Costelloe James, Treensealy, Co. Mayo

1742 Costeloe Stephen, Dublin, gent.

SOURCE: https://archive.org/details/indextoprerogati00vica/

Ireland, Betham Genealogical Abstracts, 1179-1830 - (alphabetical by surname)

• Francis Lord Baron Athenry
  -2 Feb 1749, 14 Jul 1750
  -only son Thomas Bermingham & his wife Jean Bermingham eldest daughter of Sir John Bingham
  -dau Mary wife of Edmond Costelloe Esq

• Charles Costello
  -23 Oct 1718, 8 May 1719
  -son William
  -wife and children

• Charles Costello of Tobrakan in the barony of Costello
  -28 Nov 1737, 16 Feb 1738
  -son Edmond
  -dau Margaret
  -brother Francis C
  -brother Walter
  -sister Mary wife of [blank] Bourke

• Edmond Costello of Dublin Esq
  -2 Dec 1769
  -lands Tallaghanmore in the barony of Costello in Co Mayo
  -wife Hon. Mary
  -dau Ellis
  -dau Margaret
  -son Thomas C
  -1st son Charles C
  -Thomas Earl of Louth Ex

• Stephen Costello
  -27 Feb 1741
  -wife Frances C
  -dau Margaret
  -dau Mary
  -sister Bridget

• Stephen Costello of Clonfert in Co Galway farmer
  -4 Oct 1775
  -wife Margaret Watters/Walters
  -1st son Laurence
  -2 son Christopher
  -3 son Joseph
  -Martin C. of Coltragh
  -William C. br of Martin

• Robert Phillips of Ballendoe Co Mayo Gent
  -27 Mar 1765, 4 Jun 1766
  -wife Jane Philips otherwise O'Donnell
  -niece Sarah McGawran
  -cousin Patrick Phillips
  -Robert son of same
  -Aunt Unifridd
  -James Costello grandson of same
  -cousin Mathew Phillips
  -kinsman Edmond Costello Esq
  -Edward Phillips of Cloonmore Esq
  -Charles O'Donnell of Newcastle Esq all in the Co Mayo
  -sister Elizabeth McGawran
  -to son of the same
  -niece Mary Sweeny otherwise McGawran

SOURCE: https://www.familysearch.org/en/search/collection/4496119