Ancient saint's name used for cowardly cartoon lion. 

Lambert

LEGISTER

LEOFRIC

LEOFWINE

LIEVIN

When Matthew McConaughey and wife Camila Alves chose the old English surname and place name Livingston for their third child, they elevated it from half of a Stanley & Livingston joke to a modern possibility.  Kind of.  The only other well-known bearer of the name in the contemporary world is singer Livingston Taylor, brother of James, who is called Liv.  Given that little Livingston McConaughey's older brother is named Levi, that uplifting nickname may be too close, though his parents apparently like its sound.  An original choice.

Livingston

Llewellyn/Llywelyn is a common patriotic first name in Wales, with its distinctive Welsh double LL's; in the U.S. Llewellyn would make a daring choice, though with the chance that some might find the ellen sound slightly feminine. 
 Two princes who played a great role in the medieval Welsh quest for independence were Llewelyn Fawr (Llewelyn the Great) and Llywelyn yr Olaf (Llywelyn the Last).
 Llewelyn Moss is a major character in Cormac McCarthy's No Country for Old Men, played on screen by Josh Brolin.
 Llewellyn, which can be spelled in a number of ways, has some appealing, if quirky, short forms as well--Llew, Lleu and Llelo.

Llewellyn

LLYWARCH

Lothar is cloddish, till you add a dashing io to the end... 

Lothar

LUDOLPH

LUIFRIDE

The name of a fifth century Breton saint, Mael is a popular boys' name in contemporary France, though it is usually spelled with a diaeresis or umlaut - Maël. Mael is the Breton spelling, and the pronunciation is almost like the English word mile, with two distinctive syllables. 
 
Popular in Belgium, Quebec, and Switzerland too, Mael ranked in the US Top 1000 for the first time in 2023. Given to more than 200 boys, it has international flair, a gentle appearance and a pleasing sound that is reminiscent of popular Miles and familiar Noel.
 
Used in Anne Rice's series The Vampire Chronicles and the video game series Ace Attorney, Mael also an ancient Welsh boys' name, and an old Irish word meaning "bald" or "monk", which was used to form names such as Malcolm. 
Among Spanish speakers, it is used as a diminutive of Ismael, another fast riser in 2023, and perhaps another reason for its increased popularity

Mael

MAINIER

MALDRED

MAREDUDD

MARKE

MERRY

MIESCO

MORIZ

MUIRCHERTACH

MURCHAD

NINEVAH

OSLAC

Owain is much more unusual than its brother name Owen, and feels a little more rugged, a little more adventurous and ancient.
 
Possibly an Old Welsh form of the Latin Eugenius, or, deriving from other Celtic roots to mean "born of goodness" or "born of sheep" - which might appeal to those who like Shepherd. 
 
Owain once belonged to a Knight of the Round Table and to two significant Welsh rulers, Owain Gwynedd, and Owain Glyndŵr, who resisted English rule. 
 
A more recent bearer is Owain Wyn Evans, a weatherman turned broadcaster and TV presenter. Known for his drag-themed weather forecast on International Drag Day 2017 and his hugely successful charity drumathon, Owain Wyn Evans may have brought the name to more parents' attention, as 2022 saw it return to the UK Top 1000.

Owain

Most famous as the name of King Pepin the Short, this choice might feel somewhat belittling.   The even-shorter form is Pippin, a name adopted for musical theater, and the Dutch form Pepijn is in that country's Top 100.

Pepin

PIERART

PLEASANT

PONS

NerdyNamer's list "Unusual Male Names From My Genealogy L-P" of 29 great name ideas: Lambert - PONS!

Unusual Male Names From My Genealogy L-P

Interesting and unusual names from the male side of my family tree. From the year 602 to 1983 L-P