The naming of the Baumgarten children

It's interesting to see if it is possible to work out who the children in a family were named after. You can surmise who might have been a beloved relative or a treasured friend. Of course sometimes it's completely impossible to work out who (or what!) ancestors were thinking of when they named their kids! However, the children of Samuel Christian Frederic and Mary Baumgarten née Joynes seem to have names that were honouring friends and relatives.

Name of child	Date of birth	Date of baptism	Parish of baptism	Possible namegiver
Elizabeth Mary	16 Feb 1753	22 Feb 1753	St Martins in the Field	The middle name of Mary is probably after her mother, but I'm not sure who the Elizabeth honours. I haven't found an Elizabeth amongst the Baumgarten or Joynes relatives so maybe she was a family friend. It's possible that it was for family friend Elizabeth Worrall - see Lucinda Worrall Baumgarten below.
Marie	21 Jul 1755	15 Aug 1755	St Margaret Westminster	Probably named after her mother.
Charlotte	24 Feb 1757	28 Mar 1757	St Margaret Westminster	Probably named after her maternal aunt or maternal step-cousin - her maternal uncle Samuel Joynes was married to Charlotte Tully, who had been widowed by the death of her first husband Stephen Downes. Charlotte and Stephen had at least three children, including a daughter, Charlotte, and a son, Tully.
Tully	c1759	19 Dec 1759	St Andrew Holborn	Probably named after his step-cousin Tully Downes.
Thomas	c1761	7 Feb 1761	St Andrew Holborn	Probably named after his maternal uncle Thomas Joynes.
Henry	c1761	7 Feb 1761	St Andrew Holborn	Probably named after his maternal uncle Henry Joynes.
Frederick	c1762	20 May 1762	St Andrew Holborn	Either named after his paternal uncle, Frederick Baumgarten, or after his father's second middle name.
William	c1764	2 May 1764	St Andrew Holborn	I've no idea who William was named after!
Frances	c1765	2 Jun 1765	St Andrew Holborn	Probably named after her paternal aunt, Frances Baumgarten.
Lucinda Worrall	30 Sep 1766	16 Oct 1766	St Andrew Holborn	Lucinda Worrall's middle name was in honour of Elizabeth Worrall, spinster of Kensington, who was her godmother (noted in Elizabeth Worrall's will). The reason for the choice of Lucinda as her first name is unknown.
Joynes Philip	c1768	7 Dec 1768	St Martin in the Fields	"Joynes" is clearly derived from his mother's maiden name, no idea where "Philip" comes from!

It was a very helpful exercise to put all this information into a table - firstly, I had an idea that Thomas and Henry were possibly twins, but realising that they were both baptised on the same day, when none of their other siblings were baptised with another, makes it more probable that they were twins. I wonder if they were identical or fraternal (fraternal being hereditary).

Secondly, I originally had a problem with Lucinda Worrall Baumgarten - I had her birth year down as 1756, and yet she was baptised 10 years afterwards, unlike any of her siblings. Plus, based on that birthdate, when she died in 1859, she would have been 102 - which I felt was highly unlikely in that day. Add to that the fact that she was baptised at St Andrews Holborn, when the two siblings apparently on either side of her - Marie and Charlotte - were both baptised at St Margaret Westminster. However, if we assume that 1756 was a transcription/typing error, and in fact she was born in 1766, that all works much better.

Edited on 12 January 2015 to add: Lucinda's death certificate from Mulhouse states that 30 September 1766 was in fact her birthdate.