7: Gavriil Slotkovich -New Name (NP)
Consulting Herald Fiora Vespucci.
Submitter is from Barony of Mordenvale.
Given name; masculine Russianization of Gabriel, found from the 14th century onwards.
Listed in A Dictionary of Period Russian Names by Paul Wickenden of Thanet
https://heraldry.sca.org/names/paul/g.html - no photocopy source
A Dictionary of Period Russian Names gives <Slotko> as a masculine given name.
http://heraldry.sca.org/names/paul/si.html - no photocopy source
Per the 'Grammar' section of the same source, when forming patronymic bynames: "If the father's given name ended in "-a" or "-ia," the basic patronymic ending is "-in" or "-yn," respectively (with the "a" or "ia" dropping out). Otherwise, the patronymic ended in an "-ov" or "-ev." http://heraldry.sca.org/names/paul/zgrammar.html
This gives the patronymic <Slotkov> from the given <Slotko>.
The source gives a patronymic variation of <Slotkov> in the form of <Slotkovskii> (the patronymic <Slotkov> with the addition of the masculine possessive suffix <-skii>), dated 1611-2.
Bynames ending in <-vich> are formed by adding: "an "-ich" to the basic patronymic construction... in most cases, with the exception of given names that end in "-av" (in which case, the "ov" used in construction #1 drops out to ease pronunciation)."
Using this construction, the patronymic byname <Slotkov> becomes <Slotkovich>.