William 13.4% John 9.6% Robert 8.5% Richard 8.3% Roger 4.1% Ralf 4.0% Thomas 3.9% Henry 3.4% Geoffrey 3.4% Walter 3,2% Hugh 2.6%(the above thus account for 64.6% of the Essex names in this period). The next group of names includes Gilbert, Peter, Adam, Simon and Nicholas. Over 210 other names appear, including 104 with only one recorded instance.
Alice 11.3% Matilda 10.0% Joan 6.1% Agnes 6.1% Emma 4.0% Isabel(la) 3.9% Margery 3.8% Ro(h)esia 3.2% Juliana 3.1% Cecily 2.6% Avice 2.2% Beatrice 1.8%137 other names are also attested,including 57 represented by one recorded instance. Next on the list are Margaret (which I'm considering including with Margery), Amice, Sabina, Sarra, Mabel/Mabillia, Albreda, and Felicia. (My own name turned out to be uncommon, though not rare).
I'm currently at work on turning this into a full-fledged article, including info on surname practices.
A note on spelling variations: There are a lot of them. Cecily, for instance, also includes Cecilia; Avice ias also Avicia, Ralf can be spelled Ralph, etc.
31 Jan 95 firstname.lastname@example.org