Re: Gip/Gippi/Gyppis/Gyppa.
The following names are found in the following years Gippa 1150, Gippe 1188, Gippe 1202, Gyppes 1352, these seem to all be pet forms of the name
Gilbert.
But there is also the name Gípr, Gippi found in Scandinavia (Norway) that may be related to the modern Norwegian 'gip' meaning "jaw".
Originally a by-name related to Modern Norwegian gip, "jaw." A few instances of Gípr are found in Norway. Gippi is not found in Scandinavia and appears Anglo-Scandinavian forms include Gippe, Gip, Ghippe.
Re: Vinandr
I've done a little more searching and have found the Old
German Winand, Wignand, Old French Guinant.
I believe that 'wig' means "battle, conflict" and 'nand' means "brave, bold". I'm pretty sure that Winand, Wignand is at least related to Vinandr.
I hope this is of some help. :)