I remember that somebody was interested in the HIER name in PEM. I found
the following family in the 1891 census of Risca, MON:
RG12/4380/f.50/p.11/sched.70 Main Road (4 rooms occupied)
Thomas Hier, head, mar, 47, Tinplate Worker, b. Pembrokeshire,
Mary Ann do., wife, mar, 47, b. Carmarthenshire, New Church
Katie Jones, boarder, 5, Scholar, b. Monmouthshire, Risca
Thomas and Mary Ann spoke both Welsh and English; Katie spoke English only.
Hope this helps somebody.