Hola jlchavarria:
Aunque no coincide con el año que propones te mando la lista de los hermanos Elorza/Leorza/Lorza Gil de Los Arcos y tu decides:
DE ELORZA GIL, Maria Cruz Christening
Gender: Female
Birth Date: 14 Sep 1768
Christening Date: 16 Sep 1768 Recorded in: Los Arcos, Navarra, Spain
Collection: Santa Maria; Catolica
Father: Francisco DE ELORZA
Father's Father: Francisco ELORZA
Father's Mother: Theresa ALVAREZ
Mother: Manuela GIL
Mother's Father: Bernardo GIL
Mother's Mother: Josepha DE MENA
LEORZA GIL, Leon Christening
Gender: Male
Birth Date: 20 Feb 1771
Christening Date: 21 Feb 1771 Recorded in: Los Arcos, Navarra, Spain
Collection: Santa Maria; Catolica
Father: Francisco LEORZA
Father's Father: Francisco LEORZA
Father's Mother: Theresa DE ALVAREZ
Mother: Manuela GIL
Mother's Father: Bernardo GIL
Mother's Mother: Josepha MENA
ELORZA GIL, Vicenta Christening
Gender: Female
Birth Date: 19 Apr 1773
Christening Date: 21 Apr 1773 Recorded in: Los Arcos, Navarra, Spain
Collection: Santa Maria; Catolica
Father: Francisco ELORZA
Father's Father: Francisco ELORZA
Father's Mother: Theresa DE ALVAREZ
Mother: Manuela GIL
Mother's Father: Bernardo GIL
Mother's Mother: Josepha DE MENA
LEORZA GIL, Fermin Damian Christening
Gender: Male
Birth Date: 25 Sep 1775
Christening Date: 27 Sep 1775 Recorded in: Los Arcos, Navarra, Spain
Collection: Santa Maria; Catolica
Father: Francisco LEORZA
Father's Father: Francisco LEORZA
Father's Mother: Theresa ALVAREZ
Mother: Manuela GIL
Mother's Father: Bernardo GIL
Mother's Mother: Josepha DE MENA
LEORZA GIL, Manuel Calixto Christening
Gender: Male
Birth Date: 16 Oct 1778
Christening Date: 16 Oct 1778 Recorded in: Los Arcos, Navarra, Spain
Collection: Santa Maria; Catolica
Father: Francisco LEORZA
Father's Father: Francisco DE LEORZA
Father's Mother: Theresa ALBAREZ
Mother: Manuela GIL
Mother's Father: Bernardo GIL
Mother's Mother: Josepha DE MENA
LORZA GIL, Francisco Apolinario Christening
Gender: Male
Birth Date: 21 Jul 1781
Christening Date: 23 Jul 1781 Recorded in: Los Arcos, Navarra, Spain
Collection: Santa Maria; Catolica
Father: Francisco LORZA
Father's Father: Francisco LORZA
Father's Mother: Theresa ALVAREZ
Mother: Manuela GIL
Mother's Father: Bernardo GIL
Mother's Mother: Josepha MENA
LEORZA GIL, Maria Hedubigis Petra Christening
Gender: Female
Birth Date: 17 Oct 1783
Christening Date: 19 Oct 1783 Recorded in: Los Arcos, Navarra, Spain
Collection: Santa Maria; Catolica
Father: Francisco LEORZA
Father's Father: Francisco LEORZA
Father's Mother: Maria Theresa ALVAREZ
Mother: Manuela GIL
LEORZA GIL, Fermin Francisco Christening
Gender: Male
Birth Date: 7 Jun 1785
Christening Date: 10 Jun 1785 Recorded in: Los Arcos, Navarra, Spain
Collection: Santa Maria; Catolica
Father: Francisco LEORZA
Father's Father: Francisco LEORZA
Father's Mother: Theresa ALVAREZ DE EULATE
Mother: Manuela GIL
Mother's Father: Bernardo GIL
Mother's Mother: Josepha DE MENA
LEORZA GIL, Fermin Francisco Christening
Gender: Male
Birth Date: 28 Jul 1785
Christening Date: 1 Aug 1785 Recorded in: Los Arcos, Navarra, Spain
Collection: Santa Maria; Catolica
Father: Francisco LEORZA
Father's Father: Francisco LEORZA
Father's Mother: Theresa ALVAREZ DE EULATE
Mother: Manuela GIL
Mother's Father: Bernardo GIL
Mother's Mother: Josepha DE MENA
LORZA GIL, Juana Polonia Christening
Gender: Female
Birth Date: 10 Feb 1788
Christening Date: 10 Feb 1788 Recorded in: Los Arcos, Navarra, Spain
Collection: Santa Maria; Catolica
Father: Francisco LORZA
Father's Father: Francisco LORZA
Father's Mother: Theresa ALVAREZ
Mother: Manuela GIL
Mother's Father: Bernardo GIL
Mother's Mother: Josefa DE MENA
El bautizado en 1781 puede ser el que buscas.
Saludos
Carlos Villanueva