Surname: Havenith - variants in my family tree

On my quest to find my earliest recorded HAVENITH ancestor, I have come across a few different variants. Most connected to my family, but a couple that I've seen in the same scanned collections as the records I was looking for.

Here are the variants I've found so far, in chronological order:

The earliest record I've been able to find so far is a marriage record from sometime in 1696 for Joannes and Odilia. I say sometime, as it appears to be the only record not given a day and month! It is located between marraiges records on 4 July and record is 4 9bris (November), so is likely to have taken place between those dates. In this record the spelling is HAVENIT.

HAVENIT

Moving on to 1701 and we have a baptism record for their son, Joannes Hubertus, who later used the name Hubert. This time the surname is spelt: HABENIT.

HABENIT

In 1732, Hubert got married to Cathar(ina) Emonts. At this time, the surname was written as HAVENIET.

HAVENIET

In 1754 we find the first usage of HAVENITH. This is Joannes, Hubert's son, marrying Anna Elisabetha EMONS. You will notice that JANSSEN is appended to HAVENITH. This is likely to be the priests way of remembering which HAVENITH he is - although more commonly we see place names appended in this way. It may be the surname of the person who owns his accommodation or perhaps his employer and may therefore be a 'house' or 'farm' name [1].
As family historians we work from the child (the known) backwards to parent and extended family (the unknown): It was from Joannes' baptism record that I found the name of his parents. From searching the scanned collections, there are only 1 Joannes HAVENITH and Anna Elisabetha EMONS that got married, so I feel confident that I have the correct people.

HAVENIET

Joannes, had a son Joannes Josephus baptised in 1760. We see that the JANSSEN hasn't followed him and that the current spelling of HAVENITH has remained stable.

HAVENITH

But that stability doesn't remain! 

We then have HAVENIETH which starts with Johannes Josephus and continues until 1902 when my GGgrandfather is born with HAVENITH.
While HAVENIETH remains stable during these generations in the official records, the people themselves tend to sign their name as HAVENITH. I'm not sure if this is because HAVENIETH was seen as an official or formal spelling, but eventually the modern spelling won out.

HAVENIETH

My Ggrandfather's birth record. We're finally back to HAVENITH in 1902 and this spelling continues in my family up to the present day - including my son, who was born in 2015.

HAVENITH

The following two images show what appear to be variants and in the same area (Liège, Belgium), but do not seem to be related to my ancestors:

HAAFFNIT

HAFFNIT

References1) Kimberly Powell. (nd). German Surnames - Meanings & Origins. Available: http://genealogy.about.com/cs/surname/a/german_surnames.htm. Last accessed 25/06/2015.