I am trying to trace Alice Cowin alias Quine alias Lewn who died Lonan in 1764 in particular to find her Quine husband.
She is not
Not: Alice Quine alias Lewin who died as Alice Cottier [widow of Thomas Quine of Onchan] who later married John Cottier, and moved to Lonan and was buried in 1773
Not: Will 1728 A 3 LEWN Alice quine bur 7 mar 1727;ch alice,ann,mary;husb wm;uncle danl quine supv
But she could possibly be a daughter of the above person if the alias was the other way around
Not: Alice Cowen alias Quine alias Cottier [As widow of Philip Quine she married in 1763 Thos Cowin]
Not sure if this is relevant: Robert Quyne married Onchan 1714 Mary Cown. 'lewn xd thru quyne overwritten'
Not sure if this is relevant: Alice Quine b 06 Jan 1727 Braddan Father Robert

Based on her will and other information I think this is the probable family structure. The Will of her daughter who died in 1760 confirms a marriage to Quine

Parish Lonan; location Ballacowin / Amagary

Gilbert Cowin d Feb 1742 [potential family structure]
1, married Mary Clucas d 1737
children
Daniel b 9 Sep 1718 died infant
Thomas b 16 Jul 1721
Kathrine b 6 Sep 1724
Nicholas b Mar 1726

Gilbert Cowin d Feb 1742 [potential family structure]
2, married Alice Quine alias Lewn d 1764
Alices children [father not known]
daughter Alice Quine d 1760 married 30 Jul 1743 Daniel Calister [g/d Ellinor & Ann Callister]
daughter married Nich Knacle [g/s John Knacle]
daughter Jane [possibly married Knacle
Son John Quine [possibly son in law?]

Burial: Alice Cowin Or Lewin, Burial 23 Nov 1764, Braddan

[Alice Quine assumed as wife of Gilb't Cowin but no marriage found]
[This may possibly be an earlier marriage for Gilbert Cowin 07 Jun 1681 married Margaret Quay]

Summary of Will Key Points
Last will & Testament of Alice Cowin alias Lewn 1764
She Left and bequeathed
to James Cowin son of Rob't Cowin
to her son in Law Nick: Knacle; Grandson John Knacle
to her Grand Daughters Ann: & Elinor Calister
to her grand Daughter Marg't Calister
her Right of the Crop of corn Due to her out of Balla Cowin unto Rob't Cowin [Occup't] of s'd Tenant
all her Goods Due to her son in Law Nich: Knacle & her Daughter Jane Left the s'd Jane by her father Gilb't Cowin being fully paid unto the
She Revoking all other wills made words or Intentions uttered Declared this to be her last will & Testam't & nominated
& appointed therein her Loving Son John Quine whole & sole Exec'r of all the Rest of her Goods & chattles

Will of COWN, Alice 1765-2 Lon LEWN A 42 0106224
This is affirmed to be the last will & Testament of Alice Cowin otherwise Lewn of the Parish of KK Lonnan who Departed this Life on or ab't the 1st of December 1764. Being then sick and weak in body but of perfect mind and Memory at the making thereof. first she committing her Soul to the Hands of Almighty God and Body to Christian Burial and as to her worldly Effects she bequeathed them in manner following Itm She Left and bequeathed to James Cowin son of Rob't Cowin the Third part of the sheep belonging unto her under his care or Keep- ing - Itm She Left and bequeathed one sheep to her son in Law Nick: Knacle; Itm She Left & bequeathed unto her Grandson John Knacle all the Remainder part of the s'd sheep in s'd James Cowin's Keeping. Itm She Left and bequeathed all the sheep she has walking at [Gadjoale] unto her Two Grand sons namely John Knacle & Philip Calister to be Equally between them. Itm She Left to her s'd grand son John Knacle Two sufficient shirts of New coarse Cloth & so much of Plading or white Cloth as would be sufficient for a waistcoat or parry. Itm She Left to her Grand Daughter Ann: Calister a feather bed without Beding. Itm She Devised all her wearing aparrel Equally between her Two Grand Daughters Ann: & Elinor Calister. Itm She Left to her grand Daughter Marg't Calister her best gown a bed gown & a Coarse shift. Itm She Left her Right of the Crop of corn Due to her out of Balla Cowin unto Rob't Cowin [Occup't] of s'd Tenant She Likewise Declared that all her Goods Due to her son in Law Nich: Knacle & her Daughter Jane Left the s'd Jane by her father Gilb't Cowin being fully paid unto them ___ by her some time ago. She further Left six pence Legacy to any person or persons that would claim any Right to her Effects. Lastly She Revoking all other wills made words or Intentions uttered Declared this to be her last will & Testam't & nominated & appointed therein her Loving Son John Quine whole & sole Exec'r of all the Rest of her Goods & chattles both moveable and immoveble of what Kind or Denomination so ever.
Witnesses
Alice Kelly my X } MArg't Calister my X}Jurati
At a Chapter Court holden at KK Marown june 17 1765 The /Exec'r is sworn in Court in form of Law & has given pledges for payment of Debts & Legacies namely John ___ of KK Braddan & John Skillicorn of KK Lonan Probatum est
Ro: Radcliffe
Matth's Curghey
Solv: 12d

Will of Alice daughter of Alice Quine alias Lewn
1760-1 E w CALISTER Alice QUINE [bur Lon 17591011]d 10 oct 1759;husb danl exor;ch margt,ann,ellinor,alice,philip + mary;mo alice loane als quine als Cown;

Will Lonan: Feb 1742 COWIN Gilbert amagary [eop worn] [will]

Will Lonan: 1737-2 A 36 COWIN Mary CLUCAS [bur Lon 17380120]d 20 jan 1737/8;bro john clucas(jurby)niece mary quayle als clucas;names ann fargher als vondy,ann quine als fargher,margt fargher als kneal(w/o john);bro dan(son wm);nephew robt cowin;husb gilbt exor
1737

It is quite probable that Gilbert Cowin d Feb 1742 is the brother of Robert Cowen whose daughter Jony Cowen b c1690 d 1722 married John Quine of Amagary [her son John Quine brought up by Daniel Cowen & Mary Cowen]
If correct that would indicate there may possibly be an earlier marriage for Gilbert Cowin on 07 Jun 1681 to Margaret Quay]